Patos Island is incredible. A little bit hard to get to, the cove on Patos boasts strong currents that require you to anchor with care if not using one of the few mooring buoys. Some of the campsites are rather exposed while others are well tucked into the woods.
The walk to the Patos Lighthouse is easy, short, and a must do. My favorite is going to the lighthouse for sunset. If you're lucky enough to be there when the lighthouse is open for tours you'll get a quick glimpse into the history of the islands.