On this tour you will go to the Tenorio Volcano National Park. In this park you will witness the rare phenomena of the blue river. The hike itself is medium tough and takes about 4 hours. It takes you to the stunningly beautiful waterfall, a high lookout point and the place where you can see the river change color. After the hike you will enjoy lunch and have some free time to take a quick dip in the river before heading back to La Fortuna.