Make sure to stay at Casas if you're not going on a tour bus!they're cheaper, preferred, and an easy way to exchange your USD to CUP. Btw bring a TON of cash into the island (and a suitcase full of medicine if you can, the communist party can direct you to the best clinic to bring it to). I'd say 1k per week of free cash to keep things easy and flowing and get yourself fun trinkets to fill the empty medicine suitcase. Imperial core cards and banks refuse to operate in Cuba, so do it all before you're on the plane!