Wander through three habitats in just 9 miles on this guided, bush-camping overnight through Arusha National Park. You’ll trek 6.2 miles across a savannah (home to giraffes, zebras, buffaloes, dik-diks, and antelopes). Dive into a forest alive with red-hot pokers and drapes of Spanish moss, looking out for warthogs, bushbucks, baboons, black-and-white colobus monkeys, and sykes monkeys. If you’re lucky, you may spot elephants, leopards, and hyenas in the rainforest. To bag the ashy Mt. Meru summit (14,977 feet)—and moorland and alpine desert habitats—try the 20.5-mile Mt. Meru Summit Trail.