This means free hiking, unrestricted access to some of Colorado's most beautiful places you've probably never heard of, and of course, a ton of people with dogs and Nalgenes who'll find any excuse to tell you about the 14er they hiked twice last year.
If relaxing walks through Mother Nature's beautiful bounty sound boring to you, you can hit up Public Lands Palooza (which has to be great, right? I mean, it's a Palooza!). It's there you'll find the largest flashdance in the country, food, and people from the parks department regaling you with stories about parks and being healthy. If you're outside of Denver, check the National Environmental Education Foundation's website for a Palooza near you.