There is a water park in Palm Springs. It is adjacent to Uprising, and not too terribly far from the airport, I don't believe. I don't remember an amusement park. The San Andres fault runs along the edge of the city, so that might be a roller coaster at some time

. One thing that stands out in my memory was the lushness of the vegetation, and the artificialness of it. A house will have the greenest grass and most beautiful trees and plantings. The lot next door has not been built on and is pure desert rock and sandy stone....nothing green, nothing lush. Then next door again, more green grass.....
I never felt unsafe, out running through neighborhoods alone or going to dinner etc. with the family. Palm Springs, Indian Wells, Palm Desert all kind of run together...you can't really tell where one begins or ends while driving. I liked Indian Wells.
I was in Joshua Tree in May once and it was very cool. I only had a t shirt and shorts and was freezing....air about 50 or so. We drove there from
DisneyLand. It was an easy drive. It is about equal disance from Phoenix to Palm Springs, or in any case, not too terribly far.
We really love the area and would live there in a heartbeat, although the area doesn't have the type of employment my husband does. We're in our 30's, and felt it would be a great place. Except on 117' days!