Arenal is one of over a dozen volcanos in Costa Rica, and at 5,358ft high, it’s a big one. It’s also still active, although the last eruptions took place in 1998. The volcano is the centrepiece of the eponymous National Park in the northern part of the country. The green cone of Arenal rises high above the surrounding rainforest and lakes and is a major drawcard for visitors.Guided hikes through the forest reveal old lava flows from past eruptions, and exotic birds and blooms. If your muscles are weary after your walk, the solution is right there in the shape of Arenal’s hot springs. The mineral-rich waters are naturally heated by geothermal energy, so you can enjoy a soak surrounded by the beauty of the forest.Once you’ve been revitalised by your jungle spa experience, head to Lake Arenal (Costa Rica’s largest) for kayaking or stand-up paddle boarding, or hike to the 200ft-high La Fortuna waterfall for another dip – this time in the deliciously cool pool at the base of the falls.