Visitors are not allowed to swim inside the Blue Grotto, as it is illegal and dangerous; however, you can swim in the Green Grotto if you take a boat tour around the island. The grotto is open ...

For more information about boat tours, visit the Positano Tourism Board's website. Capri Blue Grotto Small Group Boat Day Tour From Sorrento (1852 reviews) Day Trip to Positano, Amalfi & Ravello ...