Biking is a great way to get out of the car and off the crowded roads, and to explore Yosemite National Park [1] at a quicker-than-walking pace. Twelve miles of paved trails are mostly flat.
You can bring your own bikes, or rent (www.yosemitepark.com/Activities.aspx [2], daily 8:30 a.m.–8:30 p.m., $9.50/hour, $25/day) from Yosemite Village. Check at Yosemite Lodge at Yosemite Falls [3] for more information about renting and to get a bike trail map.
Links:
[1] http://www.moon.com/destinations/california/yosemite-and-the-eastern-sierra/yosemite-national-park
[2] http://www.yosemitepark.com/Activities.aspx
[3] http://www.moon.com/destinations/california/yosemite-and-the-eastern-sierra/yosemite-national-park/sights/yosemite-valley/yosemite-falls