Through COSI, students receive a discount on tours to some of Costa Rica 's main attractions. There are many options for traveling on the weekends or after classes. Our staff will be pleased to help students with hotel, tour or car rental reservations and transportation arrangements. It is easy to go by bus to most national parks. We have the public bus schedule and we buy the tickets in advance at no extra cost. Usually COSI organizes tours in the afternoons and on the weekends.