This is the famous John Muir segment of the Pacific Crest Trail that runs from Mexico to Canada. Even on day hikes be sure to pack some matches and warm clothes. The Ansel Adams contains one the most diverse trout fisheries in the nation. In places you can catch rainbow, brook, and golden trout on consecutive casts. Every day is yesterday in the Ansel Adams.
Fishing is almost always good.
Sierra trout have a relatively short growing season and they are on the continual prowl for food. Give them an excuse to eat something and they probably will. Terrestrials are huge in the Sierra. The range is bound on the west by the San Joaquin Valley and to the east by the Owen's Valley and Nevada's Great Basin. As these lowlands warm, the air rises and carries with it a payload of valley insects.