Pura Vida!
There are a couple nano-brew type places in a couple regions. For the life of me I cant remember, and I cant find the links that I apparently did not save. I want to say there was one in either Malpais, Santa Teresa, or Montezuma. Somewhere down on the Peninsula de Nicoya. Also might be one in Tamarindo. Basically just small hotels offering a few beers on a small system.
If I can find them I will let you know. Good luck and I hope to be there again soon!