We stayed here two nights while we swam in balmorhea. We pulled in late at night and we just placed $20 in the office , picked a spot and slept. The next day we swam all day and returned to a different spot. Same easy process, leave $20 in the office with your spit number. All spots are open and have full hook ups. Some are overgrown with weeds and the water isn’t accessible so choose wisely. Gravel and level spots, next to a gas station and diner.