Probably a good idea. Although there are ATMs and most restaurants take card, it is much easier to pay in cash.
No. There are taxis readily available (most of the time) to bring you and your crew everywhere. If you do decide to rent a car, we recommend booking through Kayak rather than directly through the providers. Renting a car is a really great way to see the island. However, the prices tend to be inflated in the summer.
No! We will have a bus pick up guests from the Jardim in Povoacao and bring them to and from the ceremony in Furnas. If you are staying outside of Povoacao, you will need to arrange for a taxi to get to and from Povoacao. You will also need to arrange for transportation after the wedding.