With tourism as the main industry (with diving as one of the main attractions), there is an abundance of diving facilities on the island. Many of the best diving spots are within swimming distance from shore. Tour companies and dive shops offer all-inclusive dive packages, so all you need is your certification.
It is definitely necessary to rent a car on Curacao to cover the entire island. Rental agencies are available in abundance and prices are fairly cheap. Beware not to have any valuables visible when parking the car.
Hyperbaric chamber: St Elizabeth Hospital