But there are a few other attractions, primarily the Washington-Slaagbai National Park. I strongly recommend taking a couple of tanks and sandwiches and heading north. After checking out the tiny museum, take off into the Park and be sure to stop at everything along the way. Isolated beaches are tucked under the cliffs. Take a side road to one of the few freshwater springs on the island and see tens of almost tame iguanas who seem almost begging to have their pictures taken.
Birds also flock to the oasis and it becomes hard to remember that it's basically a desert island.
Then continue northward to where the seas lessen and several of the coves are friendly to shore diving. Not too many get up this far so you will dive in isolated splendor along a sloping wall. A little further west is a public beach with a small concession, a good place to have lunch, rest and do a second dive. On the western side of the park is an interesting landscape with an inland salt lake and giant flocks of flamingos. You come out at Karpata, location of one of the best northern dive sites, and may want to burn that third tank there.