Spent 1 night. It was windy, beautiful, and the petroglyphs are super cool. There's plenty of dirt roads on either side of the gap to pull off of for a spot. Vault toilets at the info parking lot were clean too. 1 bar of verizon service in most places, but if you're strategic you can get multiple. Pretty windy. There's a donation box to contribute what you feel it was worth, no minimum use fee.

If you want to get away and have privacy, will cell signal, this is a great spot. Loads of open spaces, amazing night skies. Road on the right, north side, closest to petroglyphs viewing area is most friendly to non off road vehicles. 

Nice quiet place at night. We did a stop over for one evening. Handicap accessible vault toilet. Tour buses during the day to check out the petroglyphs. Lots of information on the history of the valleys history. Beautiful skies. Gusty winds on and off at this time of year. Worth checking out if you’re driving by or looking for a place to camp overnight. Cell service is good near the info kiosk.