I found a couple great spots right near Idaho Springs and a few more north of Silverthorne... I thought a Subaru forum would be full of suggestions but I guess not ???
I was looking at some topographic maps of Berthoud Pass, that and WP look like real promising places.. Lake Granby is a good spot too if you know where to go and beat any other campers
I'll mark up some maps to share, If you recall specific spots I'd like to know more !