I'm going for a trip in late August with my parents and child. I'm thinking of doing the Vail-Leadville-Aspen-Glenwood Springs circle. I'm trying to devise the right mix of shopping, dining, sightseeing, light hiking, maybe a little boating. We'll have about 3 1/2 days for the whole trip, so all the attractions won't fit in, obviously. What would you recommend most?