I discussed a trip I did in 3 days from Tenaya Lake over Clouds Rest, Half Dome dayhike and down to the Valley floor in 3 days. The last day was strenuous (Half Dome and hike out the same day), but the other two were easy. You can start from Cathedral Lakes trailhead to make it more difficult but see more scenery (I like the Cathedral/Sunrise Lakes area)
http://www.yosemite.ca.us/forum/viewtopic/t=278
Take the YARTs morning shuttle (see
www.yarts.org) from the Yosemite Valley Hotels and stop at any trailhead on the Tioga Road.
Another possibility is to take the YARTS shuttle to Tuolumne Meadows and hike Raffety Creek to Vogelsang the first day. Next day head to Sunrise Lakes via Merced Lake, then up and over Clouds Rest the 3rd day. Final day hike Half Dome and hike out. This is strenuous and you see a lot of great scenery.