Good thinking Nonsensical.
I had an unplanned 'drunk' with a few friends at a conference this year and am very fortunate to not have gotten myself into a stickier situation.
Planned sobriety for 2-day hotel stay:
Bring your 'jock-iest' running shorts and tee-shirt (two of them).
Running shoes
Neon socks** or just some biking socks...they are often funny looking anyway
Bjorn Borg headband in the hair or on the bald head plus optional wristbands
**Of course standing out is not a necessity but looking funny sure does make it a whole lot more fun.
Case of favorite seltzer water because whatever they charge you will be too much in my opinion. (how did I get so cheap after spending a fortune on good beers, I have no idea).
If you do not want to do the above, you could always bring your favorite speedo for the hot tub
hee-hee-he