I had a pleasant two-night stay in Honeymoon Flat Campground with my boyfriend in early June. It was the perfect base to get to everything between Bridgeport and Lee Vining, including Mono Lake, Twin Lakes, and Bodie. Between the Lower and Upper grounds, there are plenty of neat, well-maintained campgrounds available for reservation and for walk-on. It's $20/per night for a site, which gets you one parking spot, one square sand lot for your tent, a picnic table, fire pit, and some sort of metal tray thing. The vault bathrooms are kept clean and stocked (albeit stinky, but what can you expect from a hole in the ground), and the drinking fountain is really a faucet outside where you can go about your abbreviated cleansing rituals.
I would recommend getting a site near the creek as some other reviewers suggested as the gurgling helps mitigate the sound of RVs rolling by on the crunchy gravel.
The host makes his rounds throughout the day to check on all the campers. Ours was super friendly and we asked him for directions and bear sightings (there was one the first night). Our second night, a small mob of six deer was watching the grounds intently probably on the same mission as the bear.
The campground is surrounded by hills and mountains so it gets REALLY cold at night, with quite a bit of condensation collecting on our tent. Mornings were on the other end of the spectrum, the heat and light making it impossible to sleep for long (unless you're like my boyfriend who could sleep all day). The sandy ground makes for a much better sleeping experience, but we both highly recommend getting inflatable sleeping pads to make it even better! read more