One way to beat the Washington, DC heat is to take a trip to Harpers Ferry West Virginia to go tubing.
At Harpers Ferry, where the Shenandoah flows into the Potomac, I found these tubers floating down the lazy rivers on a steamy August Saturday, and they all looked more relaxed than a cat. Forget white water rafting! This water sport is the one for me!
Harpers Ferry is only about an hour north of Washington. Wel, it's a little longer on weekends because of the tubers traffic just before you get there, along Route 340. And if you bring a cooler with a picnic lunch, the cooler can have it's own tube.
You can go to an auto supply store and buy your own, or you can rent tubes and flotation vests from many of the area suppliers.
And don't forget the sun screen!