Things to do in Arenal: the best hot springs to book, from Tabacón to Rincón de la Vieja.

For the full resort experience, Tabacón, with its spring-fed rivers. For the most pools, Baldi. For quiet, limited-capacity pools, Paradise or EcoTermales. For a free-flowing river, the morning volcano hike with a hot river soak.

Each card shows today's live 'From' fare. Paradise is the lowest-priced pass on our list and Tabacón the premium one; prices change, so the listing shows the exact rate for your date.

Yes. The water is heated geothermally by the volcano system; Tabacón describes five natural springs feeding its pools. Pool temperatures typically run about 35–41 °C (95–105 °F).

Yes. All four day passes have child rates (from age 3 at Paradise). Keep little ones in the cooler pools and limit time in the hottest water.

Both work. Afternoon into evening is popular, and many passes cover several hours. Book a day pass that runs into the evening if you want to soak after dark.

Around Rincón de la Vieja, near Liberia. The Nature Day Pass and the volcano hike combo both include thermal pools and a volcanic mud bath.

Yes. The volcano-hike combo picks up from Guanacaste beach hotels for a transport fee charged per booking (not per person), or you can meet the guide at the park at 9:00 AM.

Swimsuit, flip-flops or water shoes, a quick-dry towel, a waterproof phone pouch and something warm for after. Remove silver jewelry; mineral water can tarnish it.

Six of our eight picks offer free cancellation up to 24 hours before. Tabacón and EcoTermales are final sale, so check those dates before you book.