One of Boulder’s most popular and iconic areas, the Boulder Chautauqua trailhead offers a wide variety of options. This is the Northern end of the 7 mile long Mesa Trail, which can be done in one day as a long shuttle hike to a car waiting at the other end. There are also numerous shorter options.
One can have fun exploring here without a destination or by choosing from one of many hikes, including:
Royal Arch, a nice hike up to the top of the Flatirons.
Gregory Canyon, a steep red rock canyon that goes around the Flatirons to the North.