Pat,
It is a very pretty place. Just north of Zion, very seldom anyone around. There are Aspens in the area nearing four feet around. I have never seen Aspens that large anywhere else. The Virgin River Rim mountain bike trails starts very close to this area.
While we were there, we had a fly over from the Air Force guys out of Las Vegas. They seem to buzz the lake, normally on Monday morning. You can actually see the names on the plane as they fly over, they are that low. I love the place, outside of Ouray, Colorado, it is my favorite place to camp. Not much off roading, but some fantastic mountain biking.