Yosemite National Park offers this great photo walk by the Ansel Adams Gallery which takes you around Cooks Valley. If you have any interest in photography, I would highly recommend this walk. The leader of this tour is very knowledgable in photo and points out very interesting details about the park photography itself. I can definitely say I learned a lot in that hour and a half.
Here’s a reflection of Cooks Valley shot taken while I was on the photowalk.