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The Littleton History Museum (always free)
The Littleton Museum is a 14 acre indoor and outdoor history museum depicting Colorado pioneer history. Two historic farm sites featuring a schoolhouse and blacksmith shop bring history to life in a way that consistently rates this museum as one of the top living history museums in the United States.
Prospect Artists Studio Tour
Art tours are always popular in Colorado, with several art centers located throughout the state. One of the main art districts on the front range is Prospect New Town in Longmont. The Prospect Artists in Longmont, Colorado open their studios each year for the last weekend of June. You will have the opportunity to view each artists' latest work and see the interior of each member's home or store front in this architecturally unique community. This is a special community of artists with unique expressions to match the unique architecture where they live and work.
2012 Schedule:
Saturday June 30 and Sunday July 1, 2012.
12 noon to 6 pm each day.
Where:
Prospect New Town.
Near Pike Road and North 107th Street
Longmont, Colorado, 80504.
Look for the green studio tour signs in front of the studio locations.
A map of the tour is available at www.prospectartistsassn.com.
For the latest details check the Prospect Artists Association web site: 
Denver Zoo Free Days
The Denver Zoo free days are by far the most popular Denver free days for families with kids, and are typically held during the fall and winter.
New Belgium Brewery Tours (Tuesday - Saturday)
The New Belgium Brewery in Fort Collins has had to greatly modify their previously awesome tour and beer sampling system. They never said why they changed, but it was obvious what the problem was when I visited. Because of the free beer samples, the place was overrun with college kids who wanted to party hard for free.
Now to get a small free sample you must take the full brewery tour, and reservations fill up online weeks or months in advance. If you go there without being signed up for a tour, you can still buy beer at the bar for a discounted rate.
Despite the changes, this is still an excellent small brewery to see and learn about.
Location: 500 Linden Street in old town Fort Collins.
Liquid Center Hours:
Tuesday - Sunday 10am to 6pm
Closed on Sundays until Feb 9th, 2014.
Guided Tour Hours:
Tuesday - Sunday 11am to 4:30pm
Closed on Sundays until Feb 9th, 2014.
New Belgium Beer Web Site:
Winter Trails Day (annually, in January)
Winter Trails Day is a nationwide event, with free or discounted access to many cross country (nordic) ski trails and snowshoe trails, free tours, free rentals, and that sort of thing.
Denver Art Museum (Free First Saturday)
The Denver Art Museum has a free day on the first Saturday of every month. The Denver Art Museum is a great place to spend an afternoon with friends in downtown Denver.
Celestial Seasonings Tour in Boulder (always free)
The free Celestial Seasonings tour is a fun way to learn about tea and tea making, while sampling the most popular Celestial Seasonings flavors! A stop at the Celestial Seasonings tour is a favorite vacation destination if you're traveling to Colorado.