Whenever I feel like standing around in a sleeveless shirt with my headphones on while gawking at myself in the mirror as I flex as subtly as possible, I go to LA Fitness. I just put some putty in my hair, put my sunglasses on backwards and sort of check my watch every few minutes. It's a good way to kill an hour or so. There's also a lot of ladies to check out, and no dress code, per se.
It looks like there's lots of workout equipment here too, I wouldn't mind trying it out some day.