After you've conquered the Flatirons, what better reward than an ice-cold pint of local Boulder ale? Though Denver is often regarded as Colorado's reigning beer city, Boulder can keep up, offering 20 breweries in its 27.8 square miles. To acquaint yourself with the city's suds, embark on the bike-friendly Boulder Beer Trail (which also includes stops at wineries and distilleries). Or, take the advice of visitors and locals and start your tasting tour at Avery Brewing Co., beloved for its India pale ale, brewery tours and large patio.

For a bit of history, head to the Boulder Beer Company. Back in 1979, America's 43rd brewing license was issued to two University of Colorado professors, giving them the go-ahead to open Colorado's very first microbrewery, Boulder Beer Company. Stop in for a tall glass of Hazed, an unfiltered dry-hopped ale, or a warm-weather favorite, the Pulp Fusion Blood Orange IPA.

If you're more of a foodie, BRU is the spot for you. With a full menu and 14 rotating taps (that pair with each menu item), BRU reinvents the term "pub food."

Breweries are free to visit, and most do not charge fees for guided tours of their facilities. However, fees apply for items purchased on-site. For a full directory of Boulder's breweries, check out the Boulder Convention and Visitors Bureau website.