Glendo is as full as I've ever seen it, been going up there for well over a decade now. Just got back about a week ago.
The Canyon is my favorite area to ride. Tends to have flat water most of the time and seems to be warmer.
Sandy beach doesn't really have a beach right now, due to the water level, and the rules have changed about camping on the beach. Also it's too far a drive back to town for gas or anything else, 13 miles.