America's Greenest Cities
No. 4 Denver
The Mile High City got high marks from voters for embracing nature: the outdoorsy residents ranked as the most athletic in the survey, and the city also ranked as the best place to vacation with your pet. You can keep up with the sporty locals and cut your fuel use by using the city’s B-Cycle program, where you can rent bicycles for just $8 a day; there are pickup and drop-off locations all over the city.