CSA is our favorite resort for just this reason.
The fitness center is in FABULOUS condition. They take great care of the equipment, and even though it's open air, I didn't find it intolerable at all. (Disclaimer: I am from Florida, so am possibly more used to working out in the heat than others from the great white North.)
The squash/racquetball courts are in decent shape. Not FABULOUS, but definitely playable. We've had to borrow a broom a time or two to sweep out sand left by others who were less considerate, however, that is the exception rather than the rule. The pro's who are there are primarily for tennis, however they do offer squash and racquetball lessons and will play with you. There is also a signup sheet for those looking for partners.
Can't speak to the mosquitos at dusk as we always do our workouts in the morning, and typically aren't in any ::ahem:: condition to work out in the p.m.'s.
In any case, ENJOY your trip. CSA is fabulous.
And if you're going to be there the beginning of May, 2011, my spouse will be looking for a racquetball partner. (A/Open player).
Ragnar Relay 2014 - MIAMI to KEY WEST!
Marine Corp Marathon: 10/12 4:09
NYC Marathon 11/6/11 - 4:21
Chicago Marathon 10/10/10 - 4:19
Marine Corp Marathon '09 - 4:26 / '08 - 4:28[/FONT]