- Southern Yosemite Mountain Guides (also know as SYMG) offers the finest active travel and mountain guiding trips, courses and programs in California's Sierra Nevada; including Yosemite National Park, Sequoia & Kings Canyon National Parks, Sierra National Forest, and the Mammoth Lakes region. Since 1991, Southern Yosemite Mountain Guides have been the area specialists in hiking, backpacking, f ...www.symg.com