No, it is not legal or safe to climb Arenal Volcano. There is however an extinct volcano next to Arenal Volcano named Cerro Chato which you may climb. This is a difficult hike, but possible to do in a half day.
Click here for details of the Cerro Chato hike or here for more information about Arenal Volcano.
How close can I get to Arenal Volcano?
Can I see lava at Arenal Volcano?
How many volcanoes are in Costa Rica?
What are the most accessible volcanoes in Costa Rica?
Can I climb to the crater of Arenal Volcano?
Can I hike to the crater of Rincon de la Vieja?
Can I hike to the crater of Turrialba Volcano?
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