The trailhead to the peak of Tenorio Volcano via Lago Dantas is at Heliconas Rainforest Ecolodge southeast of Bijagua. If you reach the peak you can turn north and descend past the waterfall on the Río Celeste to the headquarters on the northwest edge of the park. You’ll need a guide for several reasons. The National Park regulations require it, you will get hopelessly lost without a guide, and you’ll need a shuttle vehicle or pickup.