Might want to move this to Western...
2 good summer Colorado timeshare experiences, both have nice outdoor pools: Sandstone Creek Club in Vail where the pool overlooks a lovely creek, and Rams Horn in Estes Park, close to the national park.
But the best outdoor pool was the hot-spring-fed one in Glenwood Springs. We drove over there 2x from Vail, I think it was about an hour away, and frankly I wouldn't mind spending a whole week at that hotel, and every single day in that lovely warm pool.
http://www.hotspringspool.com/
Oh - and here's a free summer week at Sandstone Creek Club (you could spend several days at its pool, then drive over to Glenwood Springs a couple of times as we did):
http://tugbbs.com/forums/showthread.php?t=164650