First of all, it depends on who I'm with as to whether I drink or not. If I'm with my old boss, I'll toss a few back. Usually won't get drunk, though I have before. I'm not comfortable drinking around any other people, and I don't do parties. Because things just get out of control, and you never know what will happen, especially if you are around people you don't really know.
I'll usually nurse a beer, maybe two, depending on how long I'm there, but I won't touch any if I've got to drive. I'll engage myself in other ways, and if people are encouraging me to drink, I'll usually find a way to pour mine out as I go- a little here while I pretend to pet the dog, a little here while I walk around the fire, a little here as I pretend to go take a piss... ya know. I try not to get stuck in situations like that- it's only happened twice, because I generally don't hang out with people that try to pressure me into stuff.