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.
The Boulder Creek Festival on Memorial Day Weekend
The Boulder Creek Festival takes place every Memorial Day weekend in Boulder along Boulder Creek, and features great free music, dancing, rides for the kids, and other entertainment. This is one of the best festivals of the year, and a great thing to do on Memorial Day weekend.
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.
Sunnyside Music Festival (mid-September)
The free Sunnyside Music Festival is a showcase of Colorado talent that takes place each year in Denver's Sunnyside neighborhood.
Two Ponds National Wildlife Refuge, Arvada (always free)
Two Ponds is a very small National Wildlife Refuge which was created as a place for migrating birds to stop and rest.
Old Globeville Days and the Orthodox Food Festival (annually in July)
The Old Globeville Days Orthodox Food Festival celebrates Denver's international immigrant heritage with a diverse selection of free entertainment and international food. The music features outstanding performers of diverse folk heritage including an amazing Celtic performance. The incredible food selection is sample sized and you purchase tickets to try the samples. One of the best things to do in Denver on a warm mid-July weekend.
Free Summer Bowling For Students at Brunswick Bowling Centers
Brunswick Bowling Centers are offering free bowling for students during the summer of 2012. Kids or their parents (depending on age) sign up for Brunswick's Bonus Zone to get free bowling.
There are a few Brunswick Bowling Centers along the front range that offer the free bowling for kids promotion.
Find a bowling center: 
Bonus Zone Sign up:
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Hammonds Candy Tour (always free)
Hammond's Candies in Denver has been producing high quality hard candy and chocolates since 1920. The Hammonds Candy Tour shows you the process of creating and packaging Hammonds candy. After you enter the tour center and receive your tour sticker, free Hammonds candy samples are provided and you can take a hat if you like as well. You can browse the OOPS! room where Hammonds candy mistakes can be purchased for low prices.
The tour begins by watching a short movie describing the Hammond's Candies company, it's history, and the candy making process. You then enter the production viewing area where you watch the workers create candy from start to finish. You then move to the packaging area and finish with another free sample to take home before you enter the store and gift shop.
Hammonds Candy Tour Hours:
Monday - Friday 9am - 3pm
Saturday: 10am - 3pm
Closed Sunday.
Where:
5735 N. Washington Street, Denver, Colorado.
58th Street between Washington Street and I-25.
For more information visit the
Hammonds candy tour site:
Peterson Air & Space Museum, Colorado Springs (always free)
The Peterson Air and Space Museum has one of the better displays of vintage and historic military aircraft in the western United States.
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.
Colorado School of Mines Geology Museum in Golden (always free)
If you are spending a day in Golden and looking for free attractions, The Colorado School of Mines Geology Museum has a large display of rare gemstones, and their mining display downstairs should not be missed! One of the main attractions at the School of Mines Geology Museum is a moon rock collected during the Apollo 17 lunar mission!
When:
Monday - Saturday 9am - 4pm
Sunday 1pm - 4pm
Where:
1310 Maple St., Golden, CO 80401
The Museum is located in downtown Golden on the Colorado School of Mines campus, in the General Research Library building.
Check their web site for details:
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.
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.
Colorado Sports Hall of Fame (always free)
The free Museum at the Colorado Sports Hall of Fame at Invesco Field showcases the accomplishments of Colorado's finest athletes across many sports disciplines from the most popular spectator sports to little-known gems.
There are exhibits featuring many of the greatest triumphs in Colorado sports history, from the Broncos to Golf to women in sports, as well as an interactive Kid's Zone. There is also an exhibit honoring the National Sports Center for the Disabled and the Special Olympics.
Hours
September thru May: Thursday -- Saturday 10am to 3pm
June, July, August: Tuesday -- Saturday 10am to 3pm
Beware of special hours and closures before or during Broncos home games, contact the Museum to confirm hours.
Location
Invesco Field Gate #1 (western side)
For the latest info, check the Colorado Sports Hall of Fame web site: