With all of the things to do and see in a city, deciding how to spend your time can be quite an agonizing decision. 10Best has narrowed all of the available attractions in Boulder to a list of the most appealing and reputable, to aide in your decision making. You can rest easy knowing that any choice you make from our list is sure to please. Amongst the activities we're compiled, you will find two of the best parks for outdoor recreation in the country, Eldorado Canyon State Park and Rocky Mountain National Park, the Boulder Theater which hosts some of the finest local and big-name acts, and the Great American Beer Festival where you can take in some much-needed carbs after a long day of hiking. If you haven't had enough of Boulder's mountains just yet, let us recommend Chautauqua Park for some of the most beautiful local hikes and views for miles around. If you're really adventurous, you can even climb a Flatiron while at Chautauqua and then stop into their famous dining hall for some delicious lunch. With this eclectic mix of activities, you'll have no trouble finding ways to spend your time indoors, out-of-doors, or both.