Even beyond Skiing and Snowboarding [1], outdoor activities are a central focus of life in and around Mammoth. People come here from all over to hike [2], bike [3], fish, and more.
Links:
[1] http://www.moon.com/destinations/california/yosemite-and-the-eastern-sierra/mammoth-lakes/skiing-and-snowboarding
[2] http://www.moon.com/destinations/california/yosemite-and-the-eastern-sierra/mammoth-lakes/recreation/hiking
[3] http://www.moon.com/destinations/california/yosemite-and-the-eastern-sierra/mammoth-lakes/recreation/biking