Several different surf breaks:

Guiones: White sand beach with long rolling perfect lefts and rights. Guiones surf Picture Gallery

Olgas: Inside right point break, good when it's closing out elsewhere. Olgas Surf Picture Gallery

There are also several other surfing breaks within walking distance of these breaks also.

Nosara Beach Hotel: Overlooks Guinones and Olga's, as well as an outside left point-break.