Forgot to mention- you can easily spend several days in Yosemite Valley day-hiking. You get to stay in the Backpackers campground the night you come out. Then you can go over to Camp 4 (shuttle bus service easy to get there) and stay other nights. Camp 4 is a group shared campsite that cost $7 per person per night. It is a no-reserve, first come campground. Not too hard to get a spot if you go over early, weekdays (not Friday though). Most of the hikes out of Yosemite Valley are actually better done as day hikes.