Money Hint 1: Travellers Cheques are the safest, but have their price. Think of taxi charges when looking for a bank
Money Hint 2: Credit Cards are a little less safe then Travellers Cheques and offer worse exchange rates and high fees.
Money Hint 3: Do not take US Dollars to Cuba. You can exchange them at the bank, but the exhange rate is 10% worse then any other currency.
Cuba imposes special 10% charge on US Dollars as a reaction to US blockade.
Money Hint 4: Do not take any travellers cheques or credit cards issued by US banks or US controlled banks.
Money Hint 5: When you leave Cuba you can take with you up to 200 CUC or 100 CUP (moneda nacional) and save them for your next trip.
Money Hint 6: When you leave Cuba you will be able to exchange the remaining cuban pesos at the airport, even after the passpot control.