The primary reason most travellers come to Acalayong is to cross the Muni Estuary into Gabon. Pirogues — dugout canoes, some fitted with outboard motors — make the crossing from Acalayong's shoreline to Cogo on the Gabonese side, and from there onward into northern Gabon. It is one of the more obscure land-border crossings in Central Africa, and the process is informal enough that procedures vary: check with the Equatorial Guinea border officials in town before arranging a boat.
The estuary itself is wide, quiet, and edged with mangrove forest. On a clear morning the crossing is a memorable experience, and the transition from the Spanish-speaking culture of Río Muni to Francophone Gabon happens remarkably suddenly. Ensure all paperwork for both countries is in order before arriving at the water's edge — the nearest Gabonese consulate is in Bata.