You have said nothing about visiting Kings Canyon....one of the most beautiful places on earth. It is on the southwest end of Yosemite, worthy of a day+ by itself. The obvious roadside attractions (waterfalls and upward view of Half Dome) are easily managed in a day or too....it's the hiking trails that you need time to explore. Weeks, months....not hours. Climbing the Half Dome trail, the waterfall trails to the top, visiting the Hetch Hetchy and Toulumne Meadows...A couple of days spent seeing the Sequoia National Forest would be a reason to extend your stay on the western side.