Just go pick anything out of good ol' cow shit. The cow shit'll get you MESSED UP, man. Try it. Oh, and make sure to do a trip report after you get out of the hospital.
going to some random college town where you don't know anyone is not really a good way to find drugs, imo. you might get lucky, but still, it's sketchy as fuck - ESPECIALLY if you're looking for anything beyond herb
Mushrooms won't be exceeding difficult to find. It's not like trying to get acid. If you know people that smoke on a regular basis chances are you will hear something about someone getting shrooms at some point. Use that as a lead. Also, you could learn to grow in 1 or 2 full afternoons online.