If you are an amateur diver and are planning to do an introductory dive, then I recommend scuba diving at Tulamben in Indonesia. Tulamben is a small village in the north-east coast of Bali. The dive site is popular because of the wreck of the Liberty, a US Army Transport ship. Diving at a ship wreck has abundant marine life. I saw many sea horses and a sting ray. Its beautiful and I would definitely go back again. The dive with an instructor costs about USD 60 and there are plenty of diving centres in Tulamben.