Many of the hostels can arrange riding trips to the archaeological sites and the surrounding countryside.
Parque Arqueologico is San Agustin's main attraction. It features several ancient burial sites, a lot of statues and a small museum. It's 3 km west of San Agustin and can be reached by frequent minibusses.
Far less visited, a bit smaller, but equally impressive as the archaeological park. The views from the park are amazing. There is no transportation to and from San Agustin, only to San Jose de Isnos.
Within easy walking distance are the four small sites, El Tablon with several statues; La Chaquira, carved rocks dramatically set overlooking the valley of the Rio Magdalena; La Pelota, with some coloured statues in excellent state and El Purutal. These can easily be visited in one day walking.
Other archaeological sites are Alto de Las Piedras, Alto de las Guacas, Alto del Mortiño o del Tigre, Granada, El Jabón, Lavaderos o Naranjos and La Parada