Gym? - Cuth's has two, though I wouldn't know about the quality or if they work (several machines are new this year I just havn't used them).
Nightlife? Cuth's is known for having the bar everyone in the uni comes too. In fact, we have two bars now, so great places to start the night. Then after the bar I'm sure you'll find people in Cuth's ready to go out all night. On Monday our college students get into Klute free.
And I'm sorry, I know this is a thread about Grey, but those two points were asked about and Han might be interested in knowing about a college that probably ranks top based on them.