Last year I bought a one-month pass at the CSA gym for $120 and I plan to do the same this year.
I don't know if you can get a day or week pass.
The pool is nice and the hot-tub is sublime. They also have tennis and some exercise classes (according to my wife)
The gym is open-air, which is nice, but it can get humid. They have ceiling fans. It's fairly small and the equipment is 'OK'. As far as gyms go - it's basic. BUT, they have the best gym-music that I've ever had the pleasure of being subjected to.
There is a new gym opened in the spring located in town on the Sav road that is supposedly top notch, but I haven't seen it yet. Transportation to/from would be required.