I've stayed at Jellystone park a few time with my family on our way to Washington. As far as an RV park goes, I'd reccommend it. They have a pool, bikes that they rent out and a convienience store attached to the office. I know it can be easy to forget things while camping and it's nice to be able to purchase them at the site. They have hook ups for cable TV as well and the lots are spacious.
more