Why not acclimatize for Base Camp by rafting a few rivers along the way? This unique 20-day itinerary, which starts and ends in Kathmandu, culminates in a visit to Everest Base Camp on the Tibetan side of the world’s highest mountain. But before you top out at that 16,900-foot barren oasis, you’ll raft the Drigung Chu and Tolung Chu, two rivers that offer up Class IV whitewater thrills and a unique riverine view of the surrounding Himalayan landscape. Between rivers you’ll visit the most storied architecture in Tibet, including Norbulingka, the Dalai Llama’s summer palace, the monasteries of Lhasa, and more. $5,900; offered April to October.