 Yosemite Valley is open year @-@ round and numerous activities are available through the National Park Service , Yosemite Conservancy , and Delaware North at Yosemite , including nature walks , photography and art classes , stargazing programs , tours , bike rentals , rafting , mule and horseback rides , and rock climbing classes . Many people enjoy short walks and longer hikes to waterfalls in Yosemite Valley , or walks among giant sequoias in the Mariposa , Tuolumne , or Merced Groves . Others like to drive or take a tour bus to Glacier Point ( summer – fall ) to see a spectacular view of Yosemite Valley and the high country , or drive along the scenic Tioga Road to Tuolumne Meadows ( May – October ) and go for a walk or hike . 
