We stayed here for two nights at the very end of March and loved it. It's inside the park so you are a short drive to the Visitor Center. There is also a trail head for a great hike right at the campsite.

Apparently from April - October this is used for group camping and costs $40 a night but in the off season it is open to anyone for just $6 a night (no hook-ups). There is a bathroom there but it was closed for the off season.

The drive down into this campsite was a bit steep and windy but we were fine with our 30 foot travel trailer.

I forget exactly what our cell signal was like but I know Verizon was a struggle even with a booster.