Arenal
Arenal actually held the top spot for volcanoes in Costa Rica for half a century as the country’s most active volcano.
As such, it was also the most visited, and has remained so even since it entered a resting phase in 2010. The eruptions may have taken some time off, but in the Arenal National Park you can visit natural hot springs with views of the volcano and go on boat trips across the vast Arenal Lake. Other activities include rainforest hikes, whitewater rafting and horseback riding.