I generally love going to this park. The cactus gardens and Yuca are beautiful, and the staff is friendly. Unfortunately they're currently having sewer problems leaving them with no restrooms, showers, or dump station, so the place is sadly empty, with the south loop completely closed.
I'm looking forward to being able to go here again, and might chance a 3-4 day stay now in an rv, if you like being alone under the stars...
And with the border entrance to Mexico right next to the park, it's always good for a quick overnight stay. There is electricity and water. If you need anything else, the rangers can point you in the right direction.