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.
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.
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.
Golden Clear Creek Kayak festival (Wednesdays in June)
The "Golden Community Rodeo" is a weekly kayak competition in downtown Golden along Clear Creek at the Golden kayak park. You can sit or stand along the creek and watch the competition. It's pretty amazing what these kayakers can do, and definitely worth taking some time to watch. Can you think of a better thing to do on a warm spring Wednesday?
Competitors are arranged according to class. This year the classes are:
Juniors
Masters
Men: Sport, Intermediate, and Expert
Women: Sport, Intermediate, and Expert
Community Car Show and Drag Race
The annual Community Car Show in Littleton takes place Saturday September 12th, 2015, from 10am to 2pm. Admission is free both for spectators and exhibitors. The car show takes place at Heritage United Methodist Church and will include music, free snacks, and you will vote on the People's Choice winner.
After the car show, a drag race takes place from 4pm - 8pm at Bandimere Speedway in Morrison. Admission is free for spectators, and $30 for racers.
You are encouraged to bring a canned food item or good condition used winter coat or boots.
When:
Saturday September 12, 2015
Car show runs from 10am to 2pm.
Drag race runs from 4pm to 8pm.
Where:
Car show takes place at Heritage United Methodist Church:
7077 S. Simms Street
Littleton, CO 80127
(next to Chatfield Sr. High)
Drag Race takes place at Bandimere Speedway in Morrison:
Immediately off the C-470 Morrison exit.
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.
Wassail Days, Frisco | Dec 8-16, 2012
Frisco's annual Wassail Days celebrate the coming holiday season in typical Frisco style with a chili cookoff, free winter activities, and free cups of an Old English cider and spice mixture called Wassail. Local shops compete for your vote as the best Wassail in Frisco.
For 2012, Wassail Days takes place December 8th through 16th.
Some highlights of this week long event:
December 8th: Santa Dash for Cash annual run.
Tree lighting.
Chili Cook-off.
December 12th: Wassail night at Frisco's history park.
December 13th: Free Tubing at Frisco Adventure Park.
Free sleigh rides at Frisco Adventure Park.
Free Nordic skiing at Frisco Nordic Center! (I'll be at this one!)
Advance reservations are required for many of the events.
See the Wassail Days web site for reservation info: 
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Denver Museum of Miniatures, Dolls, and Toys
For the dollhouse fan in every little girl at heart, the Denver Museum of Miniatures, Dolls, and Toys has a Community Day on the first Sunday of every month, from 1 pm to 4 pm.
Willie G's Denver Happy Hour (Downtown Denver)
Willie G's is a great place to have a happy hour snack and a cocktail in the middle of the 16th Street Mall in downtown Denver. The street facing patio allows diners to relax with a drink and watch Denver tourists and businesspeople pass by.
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.
Underhill Museum | Idaho Springs | Always Free
The free Underhill Museum is a small but quaint depiction of early life in downtown Idaho Springs, with several rooms set up to display a typical home setting in the early 1900's. The kitchen in particular is very elaborate, and during better weather the Victorian Garden is open to the public. In addition, there is an old vault, antique cash register, and many photos of Idaho Springs through the years.
This free museum earns revenue for the History Society of Idaho Springs with a bookstore located at the entrance. They have an excellent selection of Colorado books as well as a large used book inventory.
This is a nice free historical museum to visit while browsing the shops in downtown Idaho Springs. I'm no fan of tourist trap shops that are full of cheap imported junk, like many of the shops in more popular Colorado tourist destinations. The shops in Idaho Springs are not like that. Many feature locally made artisan works for reasonable prices.
Fall and Winter hours 2011-2012:
Saturday, Sunday, and Monday 11am to 5pm.
Location:
The Underhill Museum is at the western end of the strip in downtown Idaho Springs on Miner Street. Look for the sign that says "Books".
While you're in the area check out the Visitor Center and Heritage Museum at 2060 Miner Street.
Historic Idaho Springs site:
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 Railroad Museum in Golden (free days)
The top Colorado attraction for train enthusiasts also has free days! A few free days are held each year at the Colorado Railroad Museum in Golden. This museum features a diverse collection of trains, some restored and some not, located outdoors. You can climb aboard some of them. There are also indoor museum exhibits and a huge indoor miniature train layout that is operated by quarters.
Zengo (Downtown Denver)
The first thing that hits you when you enter Zengo near the 16th Street mall in downtown Denver is the atmosphere. The low lighting, the expansive bar and the couches in the lounge all say one thing- "I am hip and young in Denver."