Jon's Semi-Complete To Do List:
Other than loosely being organized by category, there's no magical organizational system here. Again, with a few exceptions, nothing on this list is anything I'd consider necessary to do before I die to feel accomplished. But, I might as well make the most of it while I can.
Highlighted/italicized items are completed. Some underlined stuff leads to photo galleries, blogs, or stories, which may be relevant.

Travel-
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Go to the Alaskan Wilderness
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See Ancient Ruins
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Go to the Arctic/Antarctic
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See a Wild Bear
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Go Cage Diving with Sharks
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Tour a Medieval Castle
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Visit Disney World
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Go to an Elephant Sanctuary
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Explore the Everglades
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See the Grand Canyon
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Go to Hawaii
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Visit Italy
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Listen to Wolves Howling in the Wild
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See a Wild Manatee
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Go to New York City solo
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Visit Niagara Falls
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See the Northern Lights
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See a Panda
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Go to a Racetrack (Cars)
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Go to a Racetrack (Horses)
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See the Redwood Forests
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Go to a Western Rodeo
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Go on a Safari
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Visit all Seven Continents
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Go to the Top of One World Trade Center
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Take a Train Ride through the Mountains
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Go to all 50 US States
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Visit a Foreign Country that doesn't speak English
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See an active (or somewhat active) Volcano
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Go to Washington DC
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Go Whale Watching
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Visit Yellowstone National Park
Friends and Family-
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Go Apple Picking on a Date
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Be the Best Man in a Wedding
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Be Served Breakfast in Bed
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Win Over the Neighborhood Cat
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Go Dancing
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Be Darth Vader for Halloween
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Teach someone (Shelby) How to Drive
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Hold Hands on a Ferris Wheel
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Graduate College (X2)
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Buy a House
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Throw a House Party
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Take a Girl Ice Skating
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Be Jack & Rose on a Boat
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Do Karaoke Night with Friends
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Have a Kid
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Make Lifelong Friends in College
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Get Married
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Pull an All-Nighter with Someone Special
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Go on a Family Picnic
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Do a Road Trip
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Be Santa Claus
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Go on a Vacation with my Sister
Experiences-
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Try Ax Throwing
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Do the world's biggest Bounce House
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Gamble in a Casino
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Herd Cattle
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Explore a Cave
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Ride a Chariot
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Do a Corn Maze
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Go to a Concert
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Have a Cupcake/Pie Fight
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Play D&D
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Go somewhere in Disguise and Try Not to be Recognized
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Go Dogsledding
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Pet or Feed a Dolphin
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Go to a Drive In Movie
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Hold an Eagle on My Arm (or some other large bird of prey)
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Eat at a Five Star Restaurant
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Escape from an Escape Room
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Fly a Kite
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Fly in a Helicopter
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Fly in a Private Plane
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Get into a Food Fight
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Race in Go Karts
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Play Golf on a Real Golf Course
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Watch a Horror Movie at Night
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Ride in a Hot Air Balloon
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Cuddle a Kangaroo
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Go Kayaking
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Shoot a Military Grade Weapon
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Milk a Cow
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Hold a Monkey
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See a Wild Moose
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Ride a Motorcycle
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Rock Climb up a Mountain
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Do a Movie Marathon
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Play Laser Tag
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Play Paintball
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Ride in a Police Car (ideally without getting arrested first)
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Personally Race another Car
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Be on the Radio
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Do a Rage Room Smash
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Ride in a Rickshaw
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Slide Down Sand Dunes
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Ride a Segway
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Go Skiing
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Hold a Snake Around my Neck
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Watch the Stars in the Middle of the Night
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Ride in a Tank
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Do a Real Life Treasure Hunt
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See a War Reenactment
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Watch a Really Bad Movie
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Go Wine Tasting
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Go on a Zip Line
Skills and Self Bettering-
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Bake my own Bread
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Play the Banjo
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Become good at Basketball
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Win a semi-pro game of Badminton
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Read the Whole Bible
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Bike Ride from One End of New York State to the Other
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Craft my own Bow and Arrow
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Build a Desk
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Score a Bullseye from 10m in Archery
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Bake a Cake
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Draw a "Professional" Drawing
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Have a Signature Drink you can make really well
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Start your own Fire (without matches)
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Catch a Fish
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Fly a Plane
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Try out Gardening
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Become a Grill Master
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Learn how to Play a Song on the Guitar
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Read and Watch every Harry Potter Book/Movie
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Hit a Homerun in Baseball
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Master Horseback Riding
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Try Horseback Swordfighting
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Make your own Ice Cream
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Win a Monopoly Game
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Climb a Mountain at least 10,000 ft. high
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Paint a "Professional" Painting
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Handmake my own Pasta
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Plant a Tree
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Carve a Pumpkin
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Solve a 1000 Piece Puzzle
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Ask for (and get) a Raise
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Sail your own Ship on the Water
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Spend an Entire Day Building a Massive Sand Castle
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Have a Signature Dish
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Construct a Giant Snowman
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Become (somewhat) good at Soccer
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Substitute Teach
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Try Sumo Wrestling
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Wear a Suit and Tie out somewhere
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Go Surfing
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Defeat someone in a Swordfight
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Become good at Tennis
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Give someone a $500 (or more) Tip
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Volunteer to Build a House
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Be a Volunteer on Stage
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Spend at least 24 Consecutive Hours in the Wilderness
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Write a Message in a Bottle and Send it Away
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Get a Yahtzee in Yahtzee