Community Paddling Day.
For those in the DC area the Anacostia Watershed Society holds a community paddling day on every other Wednesday. It's from 5-7PM at the Anacostia Community Boathouse in Southeast. They bring down a bunch of canoes and kayaks. First come, first serve. There's also free hamburgers and hots dogs. It's a good way to get to know the "other" river here in the Nation's Capitol. Visit the Society's web site.