There are so many RV parks in Yuma, it is almost impossible to choose one. We found one with a really entertaining website and good reviews but when we pulled up, it is a 55+ park. They didn't mind at all and we changed our reservation from two nights to a week after staying just one night. The people here are from all over North America, probably one third Canadian, and all very active. The area around Yuma is apparently a major winter destination for snowbirds. We went to the grocery store today, and there was no way to tell what state we were in from the license plates in the parking lot. Probably 25% of the plates were from Arizona.
Nothing like Christmas lights around the pool and spa, with palm trees everywhere... I also like the military aircraft flying out of the Yuma airport. Harrier's and F-18's mostly, with the occasional C-130 mixed in. If you google-earth this airport, Air Force One is parked on the tarmac. Not here now, but cool.