Moderate. Most days involve a mix of walking, snorkeling, and boat transfers — nothing technical, but you should be comfortable on your feet for several hours. The most demanding activity is the Minas de Azufre tour: a 3km walk from the National Park checkpoint down into the caldera of Sierra Negra Volcano, across a salt layer to the sulfur mines where you can see green sulfur emissions rising from the ground. It’s a medium-intensity hike on rocky terrain — no climbing, but sturdy footwear helps. Snorkeling is included on multiple days; you don’t need to be a strong swimmer, but being comfortable in the water with a mask and fins helps. If you have specific mobility concerns, get in touch before booking and we’ll let you know exactly what to expect on each day.