Yes, it is necessary to reserve in advance. You can make the payment on our website or in advance at our Fenals premises. We carry out several guided tours during the day, choose your time slot. If you cannot find the suitable day / time for you or you are a large group, please contact us at +34 655 595 574 to check availability and make the reservation. If you are running late for a tour, let us know as far in advance as possible, and we will try to find place for you on the next one.