Playa de Isla Tortuga - the best and the only beach of Tortuga island in the Pacific coast of Costa Rica. This is a purely tourist attraction. Every morning boats come with crowds and every evening go away back. Anyway, it is worth to visit once, as the local landscapes are beautiful. Shore and seabed: sand. 
Take bus or taxi to Paquera town in the south of Nicoya peninsula. Boats to the Isla Tortuga island leave from many coastal villages: Montezuma, Cabuya, Mal Pais, Santa Teresa or Tambor. In most cases, it is a package tour including meals.