But big picture....
Hours of operation definately. My gym is open 24hrs.
I like having a steam room available. And there also signs saying a bathing suit is MANADATORY. Otherwise you get your membership revoked.
I hear people say cleanliness. Yes you want the place to be kept up with, but at the same time, you're at a gym dude, not a day spa. Go to L.A. Fintess if you want to workout wearing make up, see your reflection off shiny equipment and don't want to break a sweat during the course of your workout.
I like not having to listen to top 40, hip hop, or fuckin dance club music. No prob with my gym there either.
Lots of equipment is a must. If you like that too, then join a big gymm, not a small one.
Parking is nice. My gym now, the lot can get packed, but you can always still get a spot. The old corporate gym I used to work for, forget it. People used to seriously say all the time, that they just said fuck the workout and went home cuz they had to drive around for days trying to get a spot.
And I like that my gym is not corporate. There's a big differene between making members happy and getting down on your hands and knees to kiss their ass. I also like that as a trainer we get paid very well and don't have to try and sell RIDICULOUSLY INFLATED CORPORASTE PRICES, and that we as trainers keep the majority of the money, with only a portion going to the great people that run the PT Dept at my gym. And that they aren't up our ass all day every day asking where our sales/session counts are at.
That's my input. And as you can tell, I love my gym!