1 Go to the prom: It's a once-in-a-lifetime opportunity. If nothing else, go to say you did it. Who knows, you might actually have a blast!
2 Pull an all-nighter: Hang with friends and throw in some movies, games or social networking. High school is an ideal time to do this, because you don't have too many responsibilities, yet you're old enough to keep your eyes open all night long.
3 Tell someone you have a crush on them: Yes, it could be mortifying, and yes, you might feel like dying of awkwardness afterward, but it won't be the end of the world. If the feeling is mutual, you might be missing out on a great potential relationship if you don't tell the person. You'll never know unless you try.
4 Stop caring about what other people think: You'll be significantly more comfortable in your own skin and enjoy the here and now.
5 Clean up your Facebook: After graduation, you want to start off fresh. Go through all those "friends" and remove the ones that are more like an I-was-in-your-freshman-bio-class acquaintance. You'll be stepping out into the more professional world, so do what you can to remove unseemly posts and revise your privacy settings.
6 Talk to someone you've never talked to before: Once you're in high school, the cliques tend to become set in stone, but break out of your ordinary routine by expanding your network. New friends are found in the most unlikely places.
7 Sleep in a car: It's not exactly luxurious, but it's a novelty and sort of exciting to wake up like you're a nomad in a nonbedroom, nonbed environment.
8 Go to a football game: Just like prom, the classic high school football game -- full of screaming students and bubbly cheerleaders -- is a memory unique to high school. Football games at higher levels consist of more intense competition and unfamiliar players rather than interschool camaraderie and classmates.
9 Go on a road trip: Hit the road with your best buds and enjoy the journey as the big, wide world flies past your car window.
10 Go to a midnight movie premiere: There's nothing like squeezing into a jam-packed theater to immerse yourself in the complete awesomeness of that movie you've been dying to see.