The correct statement about the Arenal volcano in Costa Rica is:
• Visitors to the volcano area can participate in hiking, zip-lining, massages, and baths.
Arenal is a popular tourist destination that offers various activities, including hiking and relaxation options such as hot springs. The volcano itself was indeed active until 2010, but as of now, it is considered dormant, and the area is not closed to tourists. Additionally, while costs can vary, many options are available to suit different budgets.