2 hours from the hotel, 1 hr 40 min from Denver. The park entrance is in Estes Park which is fun to visit. Home of the Stanley Hotel (the Shining was filmed here). Drive through the park to scenic areas, or go for a hike.
Hiking, restaurants, and shopping (1 hour from the hotel).
Tap the Rockies on a Coors brewery tour, stop by the Golden Mill for lunch or dinner, Tube the river (rentals available).
1.5 hours from Denver. Add a few days to your trip, or take a day trip. If you've never been to Colorado, you should definitely go see the mountains!
World famous outdoor music venue, 20 minutes from the hotel.