Yosemite National Park is my favorite national park in the United States. In the summertime, the tourist flock to it in droves. Try getting a lodge or campground reservation inside the park and you know what I mean (there are few hotels outside the park). Yosemite Valley gets the bulk of the traffic for good reason. When it gets crowded, I like heading out on Tioga Road where the volume of people is significantly less. Not only is the scenery still beautiful, you also get different looks to some of the famous rock formations, like this one of Half Dome. Try it if you want to try something new and avoid the crowds.