Rocky Mountain National Park is arguably the most accessible park in the Western USA, being only a few hours away from Denver. It is also one of the most impressive national parks in the entire nation and receives a boatload of visitors. Spend a day exploring this park, either renting a car to drive the superlative Trail Ridge Road (summer only) or via one of the many trails.
Seed & Smith is a good place to start learning about it the industry in America, but in the state of Colorado particularly. They even have a “sniff station” here to get your nostrils full of 420-friendly scents. Taking a weed tour is definitely one of the more unusual things to do in Colorado and one for anybody who’s interested in just how the heck it all works.
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Why go? Peep iconic modernist furnishings (see: Irving Harper’s marshmallow sofa and Pierre Paulin’s ribbon chair) and exquisite Art Nouveau and Art Deco housewares. Located in the studio of its late namesake, Vance Kirkland, the collection is displayed salon-style—which means that you’re surrounded on all sides by irreplaceable objet d'art as you wander through the galleries. (For better or worse, children under 13 are not admitted.)
If a Jeep or other 4×4 just won’t cut it for you, and you’re actually more of an outdoors person who likes to be in it rather than just drive through it, how about climbing? Garden of the Gods also has some absolutely awesome climbing routes (Montezuma’s Tower is ah-mazing) and makes for one of the best adventurous things to do in Colorado. We mean, how could you not get better views of this stunning location without climbing up high? It’s not just for veteran climbers: people with different experience levels can get on board with this one.
Why go? In 1983, a little-known Irish band happened to film a performance at what you might call nature’s own music hall—and the rest, as U2 fans know, is rock history. Of course, it also serves as one of the world’s most breathtaking gyms, where runners get super-sweaty attempting to tackle the seemingly endless staircases and hikers hit the trails through the surrounding 868-acre park. 
It might not be the cheapest thing to do in Colorado, but heading up to the Peaks Lounge at the top of the Hyatt Regency is definitely one of the best things to do in Denver at night. The view from up here on the 27th floor of the Hyatt building offers up an immense vista of the city skyline. Have cocktails as the sunsets and watch the buildings of Denver begin to glitter in an urban light show that you really should capture to show off just where you are and what you’re doing. To top it all off, Peaks Lounge has great service (as it should) and an awesome ambience. Definitely one of the best things to do in Colorado for couples, actually.
Why go? Possibly nerve-wracking and definitely slow-going yet breathtaking in every sense of the word, Mount Evans Scenic Byway takes you past alpine lakes and meadows, through bristlecone-pine stands and the habitats of elk and bighorn sheep; along the way, you can hike, fish, picnic and even snowshoe. The summit itself is accessible only in summer—and even then the weather can turn nasty without warning.
The 16th Street Mall is to Denver what Rodeo Drive is to Los Angeles. This mile-long pedestrian thoroughfare, which stretches across the southern end of the LoDo district and bypasses Larimer Square, is lined with a variety of stores, restaurants and entertainment venues, making it a popular place to visit at nearly all hours of the day (although some travelers note that the area can feel a bit dicey at night, despite a heavy police presence). Even if you're not looking to give your credit card a workout, recent visitors recommend taking a stroll along the 16th Street Mall, as it leads to some excellent people-watching.

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