Amani Medical Research Station, located on a ridge within the Usambara Mountains, has been made a nature resorve some years ago, when rapid deforrestation became a threat to this fantastic ecosystem. Amani itself, with a government run simple but beautiful guesthouse, is like a German village preserved, and not changed in the last 100 years: the bookbinding atelier is still open, in the library there are hardly any recent books but lots of great atmoshere to do one's one studies, the post office is open every day, and staff super friendly, even though saddened that their centre has now moved to Tanga.
In the surroundings one can go for endless walks, hikes and bike rides through forest, tea plantations and garden landscapes. Rudimentary maps, and guides are available at the Amani Nature Reserve centre just a few minutes below the Resthouse, however you can easily go on yourself as well. There are plenty of people on foot along the tracks and trails to follow and ask.