Bolded ones are the ones I really want to do.

• Go on a search for as many good climbing trees as possible, climb as high as you both can in all of them, compile photo evidence.
• Go to a major chain bookstore, and leave notes to future readers in copies of your favorite books.
• Dress up as a ghost and have him/her dress up us Pacman. Walk around downtown holding hands, and whenever anyone sees you two, pretend to be embarrassed, and run off screaming “wocka wocka wocka.”
• Create photo evidence suggesting that you went on an adventure that didn’t really happen.
• Dress up as superheroes and stop at least one petty crime “ie. jaywalking, littering….”
• Build forts out of furniture and blankets, and wage war with paper airplanes.
• Try and visit as many people as you can in one night, and turn as many things inside their apartment upside down as you can, without them noticing.
• Go to the airport, get the cheapest, soonest departing flight to anywhere when you show up, and stay there for a weekend.
• Write a piece of fiction together. Outside at a cafe. Ask strangers when you get stuck.
• Dress to the nines, pretend to be married, and test drive very expensive vehicles at an auto dealership.
• Do the lamest tourist thing in your area that you have both secretly wanted to do forever. Have an unabashed good time!
• In the middle of the night, drive to the beach, so you arrive just as the sun is rising. Have a breakfast picnic, then fall asleep together. Bring a sun umbrella.
• Drive somewhere unknown and have dinner in a city you’ve never been to. With fake names.
• Go to a minor league baseball game under the stars. Tell each other stories about how bad you are at athletics. Randomly cheer for both teams. Eat lots of Cracker Jacks.
• Walk around a city and perform short silent plays in front of security cameras.
• Walk around the city all night and find a place to eat breakfast at dawn.
• Rent a movie you’ve never seen before. Set on mute and improvise dialogue.
• Pretend you've never met, then loudly try out lame pickup lines in a swanky bar. Act like they worked.
• Go on a walking journey and every fifteen feet draw a chalk arrow in the direction you're going. At the end of the trip, leave a big pile of chalk.