The coast north and south of Natal is hemmed with shallow coral reefs that make for perfect snorkeling. Nowhere are they more impressive than in Maracajaú, about 1 hour north of Natal. A stop here is often included in a full-day buggy tour; if not, ask your buggy driver. You need to time your arrival with low tide to get the most out of your snorkeling. From the beach a boat takes you about 7km (4 1/4 miles) offshore to a moored diving platform. At low tide the honeycomb of reefs forms natural pools rich in tropical fish and other marine life. As the maximum depth is about 4.8m (16 ft.), these pools can be easily explored with just a mask and snorkel. The water is crystal clear and warm. Expect to spend at least 2 hours.

Note: If you've never been scuba diving, the company offers a "baptism" dive. The water is never deeper than 4.8m (16 ft.), so there is no danger of sinking or decompression. The cost is R$80 (US$40/£20) for 15 to 20 minutes.