Hacking.

There are two "flavors" of hacking. There are the well-known hacks, like the Campus Police car on the Great Dome, and there is also a "getting into places you aren't supposed to be in and not getting caught" variety. I was an active participant in the latter, back in the day. I've been up abandoned elevator shafts, down steam tunnels, up on roofs... good times :)

Keg walk with only Greeks allowed...similar to a pub crawl, except with fraternity/sorority houses.

OMG, let us not talk about the places I got into-- comes from going to college at 16. aephialum, you and I are 2 of a kind!