Part of El Viejo experience included a ride on a boat in the Rio Tempisque. The Rio Tempisque is a river that is brackish, meaning it has a mix of salt and freshwater. It is inhabited by many creatures, including crocodiles.
I had never seen a crocodile outside of a zoo (besides on Discovery or Animal Planet). There were a lot in the Rio Tempisque.
El Viejo was worth the trip. I highly recommend it to anyone that wants to experience more than just the coastal, beach towns of Costa Rica. The beaches are not the only beautiful thing about the amazing country of Costa Rica.