There are 4 airports accessible for Tambor area in Costa Rica.
Daniel Oduber Quirós International Airport (LIB) in Liberia is about 3 hour drive through the countryside and forest.
Juan Santamaría International Airport (SJO) and and Tobías Bolaños International Airport (SYQ) in San Jose are about 4 hour drive.
If you are driving from the capital city of San Jose, a 2-hour drive will take you to the port of Puntarenas. Here you will board a ferry crossing the Gulf of Nicoya to the town of Paquera, taking about an hour. Choose a spot where you can observe the waters, and weather permitting, you can catch a glimpse of dolphins, pelicans and marine turtles along the way. Once off the ferry in Paquera, a short 45-minute drive will get you to Tambor Beach.
Tambor Airport (TMU) in Tambor is a short 25-minute local flight from San Jose.