Arranges diving and snorkeling trips to area reefs. A two-tank dive costs about US$70. Snorkeling for US$40; Cenote dives for US$110; Cozumel for US$135. Avenida 5 between Calles 8 and 10 (in the Maya Brick Hotel), Playa del Carmen. Phone 873-0302. http://www.tankha.com.