Buffalo Bill's Grave and Museum (Pahaska Teepee) on Lookout Mountain in Golden, CO. Just outside of Denver, this is a family, kid-friendly tourist destination. The views are spectacular and the museum is well done.
The Georgetown Loop Railroad that departs from either Devil's Gate Station or Silver Plume Depot is a fun tourist attraction for the whole family. It traces a restored mining route, can include a mine tour and panning for gold or silver, and uses historic, restored steam locomotives. At a moderate price, it's a good daytrip from Denver, Colorado, into the Rockies.
The healing hot springs at Glenwood Springs, Colorado, in the Rocky Mountains has been a draw for tourists and swimmers since before the first homesteader in the 1880s. In addition to the spa resorts, it offers history such as Doc Holliday, wonderful restaurants, historic hotels and even an altitudinous amusement park! Just a few hours west of Denver by car or Amtrak, it makes a great weekend destination.