The trip in short
Costa Rica lies on the Ring of Fire, and this trip follows it. From Irazú volcano you see two oceans on clear mornings, the Poás crater is a kilometre wide and acid turquoise. Then the perfect cone of Arenal, with hot springs, and to finish the mud pots of Rincón de la Vieja. All the volcanoes in a row, from the Central Valley to Guanacaste.