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In the restaurant behind the National Park's reception (see "Eat" section), you can book a tour down the river in inflatable Kayaks. It starts in Ranomafana village and takes you a few kilometers eastwards through sparsely populated area, not through the national park's forests, however. The price includes transfers to the starting point and from the end point back to the reception (or your accommodation, which is likely to be on the way).
Shorter walks are very easy and lead into secondary forest where lemur species can be observed. Longer walks lead into very dense primary forest where very rare species can be observed. The park management proposes walks lasting 6 to 8 hours; while this sounds tough, they can be done by persons with insufficient fitness as most of the time is spent observing animals. It's worth to do more than only one of the walks. Be prepared to wake up early as this is when the animals are most active. Be aware that not all trails start at the reception, you will need a transportation to get to the starting point of a few of the trails. Bring insect repellent and sufficient water. Wear long-sleeve clothes to avoid being bitten by insects and good shoes.
Piscine thermale
A small pool with water from a hot spring. Leave all your valuables at your accommodation when going. Ask around about when it is refilled, as it closes for this purpose.