Rio Celeste Four-Hour Hike to the Blue Waterfall from La Fortuna

The Rio Celeste hike fills a full day from La Fortuna and spends about four hours on foot inside Tenorio Volcano National Park. The effort is rated medium tough, and some guests find it a bit hard. The trail ends at a river that turns blue. The colour comes from a chemical reaction where two rivers carrying different volcanic minerals merge, a rare phenomenon, and the walk reaches the spot where that change of colour can be seen. Along the way the route passes a waterfall and a high lookout point that suits photographs. Lunch follows the hike, and there is free time for a quick dip in the river before the group heads back to La Fortuna. The meeting point is the Red Lava Office, in front of Relax Termalitas Hot Springs.