East of the Grupo Norte, the main path crosses Arroyo Otolum. Some 70m beyond the stream, a right fork will take you to Grupo C, a set of jungle-covered buildings and plazas thought to have been lived in from about AD 750 to 800.
If you stay on the main path, you’ll descend some steep steps to a group of low, elongated buildings, probably occupied residentially from around AD 770 to 850. The path goes alongside the Arroyo Otolum, which here tumbles down a series of small falls forming natural bathing pools known as the Baño de la Reina. Unfortunately, you can’t bathe here anymore.
Across the bridge and a bit further downstream, a path goes west to Grupo I and Grupo II, a short walk uphill. These ruins, only partly uncovered, are in a beautiful jungle setting. The main path continues downriver to the road, where the museum is a short distance along to the right.