Can't speak for the Westin, we stayed at the Hyatt in November for 7 days and brought out 3 kids - 4, 2, and 6mos. The kids had a blast at the kiddie pool which is directly adjacent to the main pool. It is a shallow 1 1/2 ft round pool with a kiddie waterslide that your older one will enjoy. We tried going to a different beach each day but the kids just looked forward to coming back to the hotel pool.