This scientific station, run by the Mexican government in partnership with private funding, works to conserve the endangered sea turtle. You can see rescued hatchlings in three large pools or watch larger turtles in sea pens. There's also a small museum with an excellent display on turtles and their ecosystem. From May through October you can join the staff in collecting and hatching eggs, and in the fall you can help release baby turtles.
Take Av. Rueda Medina south of town; about a block southeast of Hacienda Mundaca, take right fork (smaller road that loops back north called Sac Bajo); entrance is about ½ km (¼ mi) farther, on left, Carretera Sac Bajo Km 5, Isla Mujeres, Quintana Roo, 77400, Mexico