Surfing is a must try in Costa Rica. You can get surf lessons pretty much anywhere on the beach. It is one of the most popular things to do in Costa Rica. Tamarindo, Jaco, and Puerto Viejo are great places to surf.
On Sunday, May the Moon will pass in front of the sun, transforming sunbeams across the Pacific side of Earth into fat crescents and thin rings of light. It's an annular solar eclipse, in which the Moon will cover as much as of the sun.