Garden of the Gods, Colorado Springs (always free)
Garden of the Gods in Colorado Springs is probably the most beautiful small park in the state. Paved trails make it easy to wander around and check out the amazing cliffs and spires. Picnic areas, paved and unpaved hiking trails, horseback riding, a trading post, and a visitor's center with amazing views; Garden of the Gods is a great place to spend a day.
Snowmass Summer Concerts
On summer Thursdays and Fridays the laid back atmosphere of Snowmass Colorado comes alive with their free Snowmass Village Summer Concerts. The music, set up on a Snowmass ski run stage near the upper village, is loud and wild.
When:
Summer Thursdays (and sometimes Fridays) from 6:15 to 8:30pm.
Where:
Snowmass upper village.
Schedule:
The 2013 Snowmass Village Free Summer Concert schedule is as follows:
June 20: Freddy Jones
June 27: The Dunwells
Friday July 5: CJ Chenier
July 11: The Revivalists
July 18: Mountain Standard Time
July 25: J.Boog
August 1: Tab Benoit
August 8: Nigel Hall
August 15: Robert Walters
More Info from the Aspen Snowmass web site: 
Manitou Springs Great Fruitcake Toss Festival (annually in January)
Colorado is known for it's goofy festivals and the Great Fruitcake Toss is certainly one of the headliners. This Manitou Springs tradition is held every year after the holidays in an effort to dispose of certain unwanted confections you may have acquired.
Some people prefer to launch their cakes by hand but many choose to build elaborate contraptions to give their fruitcakes the send off they deserve. There are various cake launching categories as well as competitions for the best and prettiest fruit cakes.
When:
The 2014 Great Fruitcake Toss festival has been cancelled. Hopefully it will be back in 2015.
Where:
In Manitou Springs at the Manitou Springs High School track.
401 El Monte Place
Manitou Springs, CO 80829.
Denver Mountain Parks (always free)
The city of Denver operates a series of beautiful and diverse parks in the foothills areas west and south of Golden.
Pueblo Chile Festival
The Pueblo Chile & Frijoles Festival in Southeast Colorado is guaranteed to burn your eyes with fun! Besides being overcome with tears in the chili roasting area, you will find a diverse selection of music and dance performances as well as local vendors.
Colorado Dragon Boat Festival (end of July)
Held annually at the end of July, the Colorado Dragon Boat Festival is a colorful and tradition-filled celebration of Asian culture. The adult and youth boat racing competitions have grown every year and are an amazing event to watch. The performing arts stages feature the talent of Asian dance and music performances as well as martial arts exhibitions. A colorful and amazing festival and a great thing to do on a summer Denver weekend.
Don't miss the 2016 Colorado Dragon Boat Festival!
Wheat Ridge Greenbelt (always free)
The Wheat Ridge Green Belt, also known as the Clear Creek Trail, is a beautiful area in the Denver Colorado suburbs to hike, bike, or just play on the jungle gyms!
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National Center for Atmospheric Research, Boulder (always free)
The National Center for Atmospheric Research (NCAR) has created a beautiful nature preserve on their property on Table Mesa Drive in Boulder, at the base of the Flatirons.
Boulder History Museum (free first Sunday monthly)
The Boulder History Museum offers free admission on the first Sunday of every month. This is a great deal and a chance for the rest of us to check out the museum's permanent displays, changing exhibits, and kids activities.
Irish Snug Denver Happy Hour (Capitol Hill)
Happy hour at the Irish Snug just south of Denver offers cheap, quality food and more than affordable drinks. Their happy hour menu is offered every day from 3-7 and 10-12. A diner will encounter traditional Irish fare, such as corned beef sliders and sangers. If you don’t like Irish food, don’t worry. The Irish Snug also offers burgers, tex mex and sophisticated American bar food.
Longmont Studio Tour (September 29-30)
U.S. Mint at Denver Free Tours (Monday - Thursday)
Denver Mint Tours are closed for construction through February 27, 2014.
If you ever wanted to know where that change in your pocket comes from, the free Denver Mint Tours are the place to find out! Tours are free of charge Monday through Thursday at the United States Mint in downtown Denver. Reservations must be made in advance through the United States Mint Tour Reservation System
The Denver Mint building is highly secure, so you will need to pass through a security screening before your tour begins. Many common items are not permitted on the tour, such as purses, check their web site for a detailed list of prohibited items. The tour itself is very informative and interesting, discussing not only how new coins are made but also America's coin making history.
When:
Year-round, Monday - Thursday.
Reservations are required.
Be at the tour entrance 30 minutes prior to your tour time.
Location:
320 West Colfax Avenue
It's just off the southern end of the 16th Street Mall near Civic Center Park.
Visit their web site for tour details and reservations:
Liftopia Ski Discounts
Colorado resorts offering substantial Liftopia ski discounts:
Arapahoe Basin.
Copper Mountain.
Durango.
Loveland.
Monarch Mountain.
Ski Cooper.
Sunlight.
Winter Park.
Some other resorts have discounts on Liftopia that really aren't discounts at all.
Check out Liftopia:
Rentals
If you need to pick up rentals on your way to the mountain, my favorite super cheap rental shop is Maison De Ski in Idaho Springs.
Golden History Center and Astor House (free days)
The Golden History Center, along Clear Creek next to the Golden Library, and the Astor House Museum, offer free days from time to time. The next free day is during the winter Candlelight Walk, December 5th, 2014.
Details from the Golden History Museums web site: