Summersville Lake is the largest lake in West Virginia. Its a great place to swim, fish, rock climb, hike, bike, and boat. There are also some great stops in the area including a winery and state park
Visit Southern West Virginia: Great place to spend a day 'on the beach' with the kids. Free (pay to park), no lifeguards but roped off where water gets deep. Lots of boats, camping and great scenery.
Visit Southern West Virginia: Every other year they have a Civil War Weekend here complete with reenactment. Next one is Sept 11, 2011. Also three gorgeous views of the Gauley River. Great day use park.