Just outside of DC in Alexandria, VA is Belle Haven Marina, where you can rent sunfish, Flying Scots, jon boats, kayaks, and canoes for two hours or the whole day. Prices range from $30 to $54 depending on timeframe. Closed in the colder months and for inclement weather.
Belle Haven Marina is located one mile south of Old Town Alexandria on the George Washington Memorial Parkway.
Belle Haven Marina Inc - Mariner Sailing School, George Washington Memorial Pkwy, Alexandria, VA 223