It might be a good idea to get a guide book...
By the way, the island you are visiting stretches all the way from its northernmost point, Murchison Promontory on Boothia Peninsula, Nunavut, Canada to its southernmost point, Cape Froward, Chile. There's quite a bit to explore.
On a more constructive note, it is feasible to do day trips to Rincon de la Vieja (Vocano, hotsprings, etc). Coffee is not really grown in Guanacaste with the exception of the Diria plantation near Nicoya. I do not know if they offer tours, though.
All the "big" sights, such as Arenal, will be too far away.
you are really into an out-of-the way spot. perhaps this link will help:
in any event, I'd get a 4 x 4 for most travels in this region, especially in the rainy season.
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