Guided canoeing on the Momella Lakes inside Arusha National Park — one of the few places in northern Tanzania where you're on the water rather than in a vehicle, with a genuinely good chance of hippos, flamingos and a wide range of waterbirds at close range.
Canoeing here is guided and beginner-friendly, gliding quietly along the shallow lakes below Mount Meru rather than through open water. It works well as a half-day add-on for travelers already spending a day in Arusha National Park, either before flying out of Kilimanjaro Airport or at the start of a northern circuit safari.