Rated among the top 50 dive sites in the world, the waters off Kas have some of the best visibility in the Mediterranean and a wide variety of sea life. Sponge divers have been navigating these reefs for decades, and it was along the coast of Ulu Burun that a 14th-century-B.C. merchant shipwreck was discovered, now displayed in the Bodrum Underwater Archaeology Museum. There are also several underwater caverns, of which the Mavi, near Kaputas Beach, is most famous. Several dive outfitters with certified dive masters provide a gateway to the reefs, caves, and shipwrecks (there's even a plane wreck) for around 30€. Bougainville Travel and Barakuda Diving Center, Hükümet Caddesi, on the hill above the harbor behind Mercan Restaurant (tel. 0242/836-2996; www.barakuda-kas.de), are two of the more established agencies, while the combined team of Hakan and Rico at Sirena Diving Center at Dogruyol Cad. 35 (tel. 0242/836-3995; www.sirenadive.com) has logged a combined 13,000 dives. All three offer much the same choices, while Barakuda also does wreck, deep-sea, technical, and nitrox dives. All can accommodate nondivers on their boats.
Sea kayaking offers a low-impact opportunity to experience the magical waters of the Gulf of Kekova, past partially submerged sarcophagi and over the sunken cities. The prohibition of swimming in the waters over these archaeological sites makes this sport a superb way to enjoy unhurried close-ups of the mysterious city walls, although admittedly, you'll need some imagination to visualize those vague underwater shadows. A kayak also allows you to navigate where large craft dare not go. The day trip (40€) is low-impact in either single or tandem kayaks, and sets off (after transferring from Kalkan and Kas) from the docks at Üçagiz. For information, contact Bougainville Travel.