Sosúa is the best place on the north coast for diving and home to one of the best diving outfits on the island, Northern Coast Divers, Pedro Clisante 8 (t 571-1028, w www.northerncoastdiving.com). The multilingual staff run daily boat trips to several local hotspots, including the Airport Wall, a 33m wall dive with tunnels, and the Canyon, two walls formed by the splitting of the reef only 2m apart. They also head further afield to the mangroves of Río San Juan and the Caverns of Cabrera (otherwise known as El Lago Dudú). The further away from Sosúa you go the better, since the local area has been sadly stripped of its reefs and there are few signs of nearby sea life. First-time dives start from US$60, with PADI Open Water courses from US$325. The shop can also arrange snorkelling trips as well as pick-ups from nearby resorts and now have affordable self-catering apartments (see Mary Rose). Merlin Dive Centre (t 571-2963, w phuket-diving-thailand.net/) and Big Blue Swiss Dive Centre (t 571-2916, w www.big-blue-diving-sosua.com), both on the beach road, also enjoy good reputations.