A city under Meru volcano became the undisputed safari capital: from Arusha depart the trips of a lifetime — Serengeti's great migration, the miracle Ngorongoro crater, Kilimanjaro, elephant-land Tarangire. Build it classic (4-5 days through all three) or mini (two days, one crater astonishing enough); add Materuni falls and respectful organized Maasai visits. Book highly-rated licensed operators — vehicle and guide are half the trip; June-October peaks viewing, January-February's calving is the insiders' window; pair with Zanzibar for the golden Tanzanian combo.