The great thing about Yosemite is, there is SO MUCH of it! Don't limit yourself to the valley, where crowds are sure to follow, but branch to some of the outer areas. One great spot to spend the evening is up Glacier Pass. A bonus for staying till sunset, you may be lucky enough to be greeted with one of the most beautiful sunsets you've ever seen. Even a regular old evening casts colors on the walls of Half Dome and the surrounding ranges that is truly appreciated at their altitude.