Adam - the one you're thinking of is Quail Ranch in Moreno Valley, and yeah, that would be a good spot.
Jeff, if your cousin is willing to venture back toward LA a bit, there are several decent courses like this, much cheaper than those in the desert. That being said, in June he'll get summer rates down there which will be pretty good everywhere... They do indeed lower the rates considerably for those willing to endure triple digit temperatures. I've done it many times myself...
Out near Quail Ranch is Moreno Valley Ranch GC - three Pete Dye nines, cheap, fun. Oak Valley is also about an hour from Palm Desert, and that's a great course that at least used to be a decent deal....
But the key here is that even the biggies down in the desert will be decently priced come June.
TH