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:
Denver Center for the Performing Arts ($10 tickets)
The Denver Center for the Performing Arts offers a limited number of $10 tickets, every Tuesday morning, for shows coming later in the week.
Golden Buffalo Bill Days (late July)
Golden hosts an annual festival celebrating the life and spirit of Buffalo Bill, who is believed to be buried at the top of Lookout Mountain. If you're in the front range during the last weekend of July, Buffalo Bill Days is one of the best things to do on a warm summer weekend.
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.
Rocky Mountain Arsenal Wildlife Refuge | always free
The free Rocky Mountain Arsenal Wildlife Refuge in Commerce City, Colorado (near Denver) is a beautiful and pristine National Wildlife Refuge, representing an impressive cleanup and conversion of a former weapons and rocket fuel processing facility. The views of the mountains from this perfect spot on the plains are quite impressive.
2017 National Park Free Days
The National Park Service offers free entrance to all National Parks a few times each year. This is a great way to explore our beautiful Colorado park lands.
Movies In the Park
Looking for a popular Denver attraction for the kids? The free Denver Movies in the Park are one of the top things to do in Denver with the family, and not to be missed if you're in Denver with kids.
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University of Colorado Museum of Natural History at Boulder (always free)
The University of Colorado Museum of Natural History is a free natural history museum on the CU Boulder campus. They have excellent changing exhibits, a dinosaur section, and an extensive bird display. A small donation is requested to help keep the museum open and free. This is a fun small natural history museum for adults and curious kids.
When:
Monday - Friday 9am - 5pm
Saturday 9am - 4pm
Sunday 10am - 4pm
Where:
The Henderson Building on the CU-Boulder campus, between 15th and 16th streets east of Broadway.
For details check their web site:
Euclid Hall Denver Happy Hour (Downtown Denver)
OK, I normally make it a policy to only check out Denver happy hours that have food specials with drink specials. However, when I saw that that 5280 had deemed Euclid Hall the best Denver happy hour, I had to check it out for myself. I went in skeptical, and came out satisfied and stuffed.
Ruby Hill Rail Yard
For about 6 weeks each year in January and February, Ruby Hill Park in Denver features a free ski and snowboard park known as Ruby Hill Rail Yard.
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.
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:
Lookout Mountain Nature Center (always free)
This free nature center on top of Lookout Mountain in Golden is one of the top things to do in Colorado with the kids.
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: