There are a few nice reefs and two ship wrecks in the Port Barton Bay. Diving is worthwhile and a must. A diving center, located in the beach, offers three dives for 4000 Peso. They also offer certification courses or you can do a “beginner’s dive” if you do not have a licence.
Aquaholics can be found in the beachfront, to the right from the main entrance (Coast Guard Post). The shop belongs to a British guy, Keith, and has been in place for many years now. You can book your dives with Aquaholics on-line or just go directly to their beech front cottage.
If you have a bit more time consider becoming a certified diver and book up for the SSI course with Martyn of Aquaholics who will not only get you ready for the exams but also will make sure that you really enjoy the course.