Looking for good Costa Rican literature

I am thrilled to be headed to Costa Rica next week to explore sustainable and meaningful travel (I'm also writing a book review of Lonely Planet's Code Green -- stay tuned at www.wanderingeducators.com), and am looking for suggestions on Costa Rican literature to bring. I am interested in novels, poetry, drama - engaging nonfiction -- you name it!

Thanks -- I'll send you a postcard!