A short, steep walk above the town centre — about an hour up from the bus stand — Gangilonga is the granite boulder that locals point out from kilometres away. From the top the whole escarpment, the town below, and the rolling Southern Highlands open out. It is one of the easier walks of its kind in Tanzania and worth doing in late afternoon for the light.
The path is straightforward but not deserted is preferable: go in a small group rather than alone, particularly later in the day. There is no entry fee and no formal guide; a kid will probably offer to show you the way for a small tip.