Stay out of the water.

I don’t think so. Three Sisters Islands (the ones in the Potomac near D.C.) are part of the Chesapeake & Ohio Canal National Historical Park, and the National Park Service prohibits swimming, wading, or even entering the water in most of that stretch. The currents are deceptively dangerous — people die there. Even touching the water from a boat or the shore could get you a citation if a ranger sees you, because they interpret any contact as wading.

**Technically, you could touch the water by launching a kayak or canoe from an authorized access point upstream and then paddling near the islands. But you can’t step out of the boat. Even then