You don't always need to head far off the beaten track to get away from the crowds. Little-visited Empakaai, only 90 minutes’ drive from the over-touristed Ngorongoro Crater, is a case in point. The second-largest caldera in the Ngorongoro Conservation Area, Empakaai is a near-perfect circular crater with a 5-mile diameter and a depth of 1,800ft. The road along the rim offers stunning views across the Rift Valley escarpment to the active volcano Ol Doinyo Lengai.

But the highlight of a visit is the short, steep hike down the forested eastern wall (look out for blue monkeys and buffalos) to the crater floor, which is dominated by a green soda lake that usually hosts large flocks of flamingos.