There is a ton of extra camping here and when we went we were surprised to see not that many others there, since it was a Saturday. This was nice in that it offered a little privacy.
The location is really easy to access, close to the entrance of the park in the case that you are not able to grab a spot in the park on the North Entrance (about 15 minutes). This makes for a great and safe alternative campground while visiting the area. While there are a lot of amenities, you really have to time it just right to take full advantage, I recommend calling a head. Seems that most of the yoga classes happen during the week and the sweat lodge is only available, when there is a retreat with the man who runs it, but seriously can't wait to experience this. That being said, there is a wonderful meditation garden, and pool. Plenty of space and easily accessible campgrounds for all vehicle types. There is currently no campfires in this campground but they are working on getting permits for the future, so stay tuned for that.
In the case that you are considering running a retreat, this would be a fantastic place for your consideration.