Lake Chelan State Park, right on the lake and 9 mi west of Chelan on the opposite (less crowded) shore, is a favorite hangout for folks from the cool west side of the Cascades who want to soak up some sun. There are docks, a boat ramp, RV sites with full hookups, and lots of campsites for those who prefer a less "citified" approach to camping.
Visit the Travel Talk forums for help on planning your trip