Divers will need cash for any purchases and gratuities. On the bus from Havana to Jucaro, stops will be made for food and restroom breaks. A crew gratuity of 15% is customary. You can easily exchange money at the airport or at any bank for CUC (Cuban Convertible Pesos). Major hotels and banks offer favorable currency conversion rates. The best currency to bring on your trip to Cuba is Euros (€). At present, there is a 13% penalty in addition to the exchange rate for US dollars.