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.
Dinosaur Ridge in Morrison (always free)
This park in Morrison, Colorado (southwest of Golden) is really an outdoor museum, where you can hike or ride a shuttle as you examine evidence of Dinosaur activity in Colorado. One of the popular Colorado attractions for kids.
Jefferson County Open Space Parks (always free)
Jefferson County Open Space Parks are probably the best park value in Colorado. A tremendous variety of parks and activities, such as hiking, mountain biking, climbing, and geocaching, all free to anyone.
Here is a list of their parks, maps, details, etc... 
Bluff Lake Nature Center, Aurora (always free)
Bluff Lake Nature Center is a free wildlife and nature center park in Aurora in the Stapleton area. Hiking trails wind their way through the park, passing a seasonal lake and overlooks. This is an excellent Denver area attraction for nature watchers.
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:
Colorado Day, Free Colorado State Parks (First Monday in August)
Colorado Day is an annual tradition of celebrating Colorado's acceptance into statehood. Colorado was first recognized as a state on August 1, 1876, and now we celebrate Colorado Day on the first Monday of every August.
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.
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Keystone Ski Resort Free Scenic Chair Lift Rides
Keystone Ski Resort offers free summer scenic chair lift rides every Friday from 3-7pm, starting June 14 and continuing until summer activities close at the end of August. The views are incredible so I would definitely recommend taking a Friday to check out Keystone.
McCormicks Fish House and Bar (Downtown Denver)
I am a sucker for old buildings, and McCormicks Fish House and Bar, located in LoDo in downtown Denver, has everything I'm looking for.
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:
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.
The Hornet Denver Happy Hour (SoBo district)
When perusing the happy hour menu at The Hornet in SoBo, just south of downtown Denver, you really only need to ask yourself one question- What will I order with my Bacon and Brie Home Fries? Yes, you read that right, you can order a plate of home fries piled with creamy brie cheese and salty bacon. What else can a person want?
Patsy's Candies Tour in Colorado Springs (always free)
Patsy's Candies in Colorado Springs takes the making of chocolate candy to a whole new level. Free tours of their factory demonstrate the handcrafted nature of Patsy's Candies and highlight the artisanship present in their high quality candies.
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.