I LOVE Palm Springs
Paul,you may not have classic PS weather if the weather system poised off the California coast is strong enough to make it to the desert, but it's a great resort atmosphere and there is a ton of stuff for four guys to do.
If you're looking for "action" there are lots of gay resorts that are open for day use. If you're looking for bears, there are a couple of resorts that are bear-oriented. Steer clear of the bath house. I've never been to a worse facility. If you're looking for fun, there are things to see and do but this place is mainly about relaxation. The visitors' center is at the top of town. If you're arriving at PS airport there is likely visitor information there at the terminal. But any gay bar or business will likely have tourist info that is geared for you and your friends. Even the straight restaurants have a good number of gay men in them on any given night. PS is the left coast's answer to Key West.
The street/farmers market I believe happens on Thursday nights on the main drag, Palm Canyon. Your typical stuff there, including "cheap dates." Where are you staying?