I agree with the cautions on attempting to anchor at Cooper Island. The mooring field there is extremely tight, one is not supposed to anchor in the sea grass, and it's always crowded. Unless you can anchor outside the mooring field it can cause problems for you and every boat around you. We've anchored around the corner from Cistern Point at Hallovers Bay. It's very nice if wind and waves are from the right direction, but untenable if not.