Unfortunately it was foggy when I went there.Go to Costa Rica during the dry season if possible:from December to May.
On the way down from the volcano I saw many plants with huge leaves.The "ticos" call it "umbrellas for the poor people".
On the way to the Caribbean plain, our tour group made a photo stop at the La Paz Waterfall. It was small, but lovely, and happens to be one of the most photographed locations in the country.
Our tour guide took us to the summit of the Poas Volcano, which is 9,000 feet. It is a mildly strenuos hike to the top, but once you are there, you witness one of the most spectacular active craters in the world. The sulfur lagoon in the center is a brilliant turquoise color. If you don't want to come back the way you went up, you can take a small trail through the cloud forest. Bring a jacket because at this altitude, it was surprisingly chilly. (Booked through www.centralamerica.com)