If you leave from San Carlos, you can go along the river by boat reaching the sea village of San Juan del Norte after a very beautiful 3 day trip.
1 hour far from San Carlos there is the natural park of Los Guatusos at Costarica borders where it is possible to see many marsh birds, cocodriles, aquatic turtles, various kinds of monkeys and the sloth.
People who are very fond of Latin/American dances, or people who want to learn them, can spend a night at "La Champa", that is open every Thursday, Friday, Saturday and Sunday.