Camping at Jenkinson Lake is big fun. Many campsites are on or near the water with direct beach access.

Sly Park Recreation area Reservations.
Sly Park Resort has a few overflow campsites with hookups and a couple of hotel rooms.

El Dorado National Forrest, has a really neat cabin just down the road in the Sly Park Recreational Area. Sly Guard Cabin

Tom Steinstra has the best books on Camping and Hiking, I have found them very useful over the years.