kingstongal

I would probably manage my time and get the taste of both the things - study part and the hot tub part
Weekend is at least 3 days away. You can keep yourself motivated that you gotta study enough in these days to compensate for the loss of your study hours on the weekend. Moreover, you don't need to the entire weekend partying there. Just be there on the strategic moments (you already know about it ;-P .
48 hours are not going to be the fun. You'll have lull in between. Just have the thing (girl/booz whatever) for which you went there and come back.

Trust me, your chances of passing or not passing are not going to change significantly if you spend some hours away from your schedule.
My 1 cent on your situation.

firat

dude take a mock exam. if you're scoring in the 50s go on the trip if you're in the 60s keep studying

my $0.02