Stayed in mid-June when Yellowstone and Teton were brimming with tourists. We had booked a back-up RV spot near the south entrance to Teton, but after looking at it just filled our water there and left (it was basically an open field with 50 of your not best friends in RV's blasting music). Took a chance on Pacific Creek. All of the dispersed camping was taken, but the campground itself, which is at the end of the road, was about empty. For $10 we got a spacious site, table and fire ring. Water was available as were pit toilets. Looks like a great equestrian campground and we saw a few parties with horses. Make sure you make use of the bear boxes, as we saw plenty of bear prints and other sign within 200 yards of our site. Lovely trails leave right from here. The camp host is a Swiss ex-musician and all around nice guy.
Being the takeout for the Westwater stretch of the Colorado, there is not much here but a parking lot, picnic pavilion and a lot of trucks with empty trailers. I think we saw 2-3 people camping - I guess waiting on boats in the morning. We made our way to Fish Ford, about 5 miles away and had a much better experience.
Spacious State Park campground with water, power and gray-water hookups. Every site had a picnic shelter and nice views of the surrounding desert. The reservoir itself, though small, had a lot of boat traffic but was refreshing to swim in. This area is a 4X4 paradise, so expect to see lots of quads and nice-by-side UTVs racing around the place. For us, it was a quick stop to top the tanks and drain the grays and for that, it was perfect.
If you find yourself in an RV in the San Diego area and want to be beach-side, this is an affordable option. Other than being close to the beach, there is really nothing more to recommend. It is a bit like camping at Walmart with 200 of your not-best-friends. Sites are pretty tight and there are a ton of longer-stay visitors with Class A RVs and large trailers with slide-outs. Apparently everyone needed to have a fire in the 85 degree heat as well, and we had to button the van up for fear of suffocation. For some reason there seemed to be a constant bike parade riding the circumference of the park for most of the night, and you had your usual drink too much and watch TV outside crew as well.
If you find yourself traveling through the Mojave along the 15 between L.A. and Vegas, do yourself a favor and stop off at this little gem of a campground. Located in Afton Canyon, this BLM Campground offers plenty of level sites, compete with concrete picnic tables, fire pits and charcoal grills. There are also pit toilets. The drive in is a bumpy dirt road about 3 miles off of the 15 along Afton Creek Rd. It was more suitable for all-wheel drive cars (esp when wet I imagine), but we saw everything from a Prius to a Class C motor home. We came in at night and found it almost empty, which was a nice change of pace. We went to sleep listening to coyotes howl in the distance. There is also the occasional train that comes through on the adjacent tracks, but it is more melodic than disturbing. The morning brought a riot of colors from the surrounding cliff faces and quickly warmed the cool desert morning. This is one of the few places the Mojave River runs above ground, so the place is teeming with birds and other wildlife. Definitely worth the stop.
Free sites right on the river with good fishing. No amenities. You may need a 4X4 depending on the state of the road. Right across the highway from a shooting range.
These sites fill up fast on the weekends, and some of the sites seem to have RV's squatting on them for weeks at a time. Some sites are right on Vasquez Creek, while others are closer to the road. Bring inspect repellent, as the skeeters can get bad due to standing water. Park in the lot at the end of the road and hike beyond the gate to get away from the crowds - planet of tent camping up that way.