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If you are trying to decide whether you should fly into the Liberia Airport or the airport in San Jose, I usually give people this general suggestion. If you are going to go the beaches in the Guanacaste area which would include towns such as Tamarindo, Flamingo or even as far South as Nosara I would suggest flying into Liberia.
If you are going to pretty much anyplace else, I would fly into San Jose. This would include going to Arenal, the Caribbean coast and the towns of Cahuita and Puerto Viejo as well as the popular Central Pacific towns of Jaco Beach and Quepos/ Manuel Antonio.
The only other point I would make about this is if you are planning on taking a domestic flight with a carrier such as Sansa then you will want to fly into San Jose.