Riding fee is the same if you camp. I was at DP in July and stayed in one of the cabins. The RV camping is alright, I mean it's pretty much a big campground. You get your hockups and you're good to go. The food at the lodge is decent, but I think overpriced. I know ... $6 for a good lunch is not a bad price and $10 for dinner bufet on Sat night, but I still think it's kinda overpriced for burgers, hot dogs and pulled pork, especially there are no fries, just chips.
Anyhow, we stayed 4 nights and enjoyed it even though it was really dusty and dry during the time we stayed. I'm planning another trip up there is year, but don't know when. Hopefully sooner than later.