Fortress of the Immaculate Conception in El Castillo
The Fortress of the Immaculate Conception is a historic site in El Castillo, on the San Juan River. It provides context for the area's past and is a different experience from nearby protected-forest outings.
What you can experience
Explore the fortress in the sections currently open to visitors, allowing time to understand its place in the river's history. Combine it with a stay in El Castillo rather than rushing between multiple boat transfers.
How to plan access
Organise the riverboat journey to El Castillo and check the fortress entrance, visiting conditions and any guide or fee requirements. Confirm how you will travel back to San Carlos or onward.
Before you go
Follow staff instructions and respect closed heritage areas. Do not invent permanent hours or prices, and plan around the real boat schedule rather than expecting flexible departures.