What the heck did you do for fun in High School?

Sleep wherever you are. May it be in your first class, or the most boring class, or whatever. I did it, and it was the best decision I ever made.

go to partyies. (kegs spoodies)

smoke greeens, fishing, bitches, shoot stuff, house party, drink and bonfires etc. Basically grind a metaphorical bowl of life, and make keef out of the good parts.

This. I talk a ton whenever I'm not sleeping....so basically all of my teachers don't even care when I sleep since I'm no longer disrupting class. Plus they know I will still get good grades...so that also helps.

Story of my life.

I got you man. The key here is to play a series of games in social interactions that are slightly mischievous but nothing major. For example: sneaking into a city wide dance mission impossible style. Sneaking onto the top of the tallest building you can. Playing laser tag without paying and without guns. Hosting a rap battle between you and your friends with a live mic in a casino. Also bonfires. Lots and lots of bonfires. My friends and I had a blast doing this stuff because we didnt party or drink or anything.

Have sex in high school. Get bitches pregnant. Abandon child.

Build bike jumps on other people's property. We did that.

when I first got my drivers license, we used to get out at night (started around 11), park our car in a driveway or something similar and wait for someone to pass by. When someone did (lonely car, noone else around, preferably some older and smaller car, not some brand new suv shit), we turned on our lights and sped after them. Just follow them around as long as possible. We had some pretty fun experiences from that. (although it is kinda childish, but on the days we didnt wanna go out and get drunk we really didnt have anything better to do).
This was in germany though and people (and cops) are pretty chill about that stuff, we never got in trouble or anything, I have no clue how people or cops in the US would react.
Its also not considered stalking (or any other criminal offense) here because stalking requires a repeated action.
Other than that, we tried immitating this:
Which is pretty hilarious but turned out harder than expected. Especially the not bursting out in laughter part...

If you dont wanna do stuff like that (kinda childish and annoying to other people, I know), just do what everyone else here proposed, get drunk/high, do some outdoor stuff and so on.

get yourself some new friends, alcohol is key

If you live near a bunch of businesses, go there at like 3 a.m. and try to get on the roof of as many of them as you can.

Grab cones and block off roads late at night, funny to watch what cars do.

I missed it, but a bunch of buddies of mine found an abandoned insane asylum and snuck in there late at night. Abandoned buildings and buildings in the process of being built have a nice sketch factor to them.

Haven't tried this yet either, but get clubs and golf balls from walmart or somewhere and sneak on to a mini golf course late at night and play.

Going go-karting with a bunch of friends at midnight was probably one of the better nights of the summer too.

Don't even need to drink or be high to have fun doing any of those things. Drunk go-karting sounds a little more fun though.

offroad, hoodrat shit, skate, shenanigans, piss of the 5-0, ski, eat lots of food, party, drive around, drive some more places, sit in a parking, sit at home, sit at school, try and get girls, get girls, get naked, blow stuff up, fire, drift. Did I miss anything?