in random order:
first and foremost, lots of good and friendly, sexy, descrete, open minded members.
dressing rooms with lockers so you can change from street clothes to play clothes. a good place to lock up valuables, keys etc.
nice big, clean hot tub(s)
three or more play rooms.... one for voyers and exhibitionists so they can see or be seen. one that has private areas. and one that is a group room for no clothing allowed and no lurkers.
restrooms with showers, just in case a shower is wanted/needed.
nice dance floor
a stage with a stripper bar for strip shows and wet t-shirt contests, etc.
nice sound system. nice big selection of all kinds of music and a really great DJ/MC
nice area for mixing your drinks. maybe even a bartender
a place for a good selection for food. the food has to be kept at safe temperatures
xxx films on big screen TVs
plenty of towels, wet wipes, and condoms conviently placed around the facility
a lounge area for visiting flirting and play
someone to cruise the place for security
a private website/forum so members can communicate and safely exchange/post pics, set up meetings, and stay in touch. a good way to inform members about upcumming events, contests, or theme nights.
these are some of the things i thought of, off the top of my head. any other ideas to make the 'ultimate club'?