The reservoir is about a across at its widest point and just under 3 miles long. That's plenty of area for sailing a small boat. The water temperature yesterday was a chilly 53 degrees, but the sun was out for part of the afternoon and the air temp was almost 75 degrees. The water was clear and clean like many mountain lakes.
There are plenty of beaches all around the lake. Some access near the boat ramp provides a nice sandy beach. Other access near the picnic and camping areas are rocky and sandy, but one could find a spot to beach a boat easy enough. The beach was very clean and it seems they enforce a no beach camping or fires policy.
The wind blew consistently out of the south most of the afternoon when we were there. Gusting winds measured up to 26 mph, but most of the day the breeze was between 5 and 10 mph, perfect for sailing.
Lots of great camping sites within walking distance to a nice beach. I've never camped here, but I plan to this summer. I can see that beaching my cat close to a campsite will be easy as long as I pick a weekend that isn't too busy.