by AlmostThere » Fri Apr 20, 2012 6:42 am
There are only four routes into the park. Two will suit your needs - both are fairly obvious on the map.
With that little bit of time, you might be able to see most of the valley and perhaps Glacier Point Rd. That would be the recommended first time I'd mention, though it will be crowded. Take the free shuttles around and drive up to Glacier Point. Take some of the shorter hikes like Sentinel Dome and Mirror Lake, the bottom of Yosemite Falls, the lower bridge on the Mist Trail, and Bridalveil Falls. Rent a bike and ride around the valley floor.