I wanna do something with my friend but we don't know what. What should we do?
Suck each others cock.
Sex
Share a meal.
Whenever my buddies and I eat out at a restaurant or something, we end up talking for, like, three or four hours. About life, about girls, about God, about politics, about school, or just shoot the shit. Some of my favorite college memories so far involve going to some fast food place with a friend and having a simple (or deep) conversation.
Try it. You don't have to do anything crazy.