At the current lake level of 3600, you'll find (from south to north) several decent sites in Dungeon Canyon (mile 38), possibly a site or two in Wetherill Canyon (mile 40), decent beach options at the mouth of Cornerstone Canyon just south of Dangling Rope (mile 40), lots of site in Oak Bay (mile 51), a few in the small inlets off the west side of the main channel near miles 52-53, one decent site in Hidden Passage Canyon (mile 56), a couple of spots in Reflection Canyon (mile 57), a few near the mouth of the San Juan River (mile 58), and a few small beaches off the main channel just north of the San Luan confluence (mile 59). Llewellyn Gulch (mile 63), which has a ton of good spots at higher lake levels, has essentially none at 3600, although a few might open up above 3610.