A nice, quiet RV park with pool we frequent for a couple weeks each year is the Cathedral Palms in Cathedral City. Its RPI and has a lot of long term winter RVers. Its probably more reasonable than any other facility in Palm Springs. Remember, it doesn't snow there.
Its not a resort type park, gravel parking and small patios ill placed because it was built when a large RV was a 24' trailer but they can fit any size RV into the spaces. Either 30 or 50 amp service.