Okay - answer these questions and then you can narrow down your selections -
do you want other "entertainment" there? Men only or coed? Do you really want to be bothered with providing food? Do you want just a room and you do the rest? do you want booze only? Is this a time to let down your hair - or do you still have to maintain workplace respectablity?
Room only - try the conference center or a local hotel - the hotel is liable to give you a discount since you are pax
booze only - most places, restaurant and/or hotels usually give you an option of having a cash bar or open.
entertainment - try a place with sports screens - like damon's or 3 bros, or a place with pool tables, or Roses place (if it is male only), or heck even hyper space or the bowling alley
don't really want to bother with the food - look at local dining establishments - most will cordone off space, are bar accessible, and will provide for all your wants with an open credit card or pre-pay - asahi, 3 bros, damons, applebees, ruby tuesdays - any of them
if you have to maintain your workplace respectability - look at the hotels, or one of the nicer dining - otherwise get creative - juvenile can equal fun