Exchange the big city charms of san francisco for the fresh air and natural beauty of yosemite californias most famous national park choose to start your time in yosemite with a reserved lunch at the renown ahwahnee dining room or head straight to the park to begin your adventure take a walking tour of the park with your guide or take off on your own youll have around four hours within yosemite to explore the scenic wonders of yosemite valley