Cueva de Saturno, a beautiful cenote near Varadero, Cuba, offers a unique underground swimming and snorkeling experience amidst impressive stalactite and stalagmite formations. It's generally accessible via a short drive from Varadero, though visitors should be prepared for stairs leading into the cave, and the deep, cool freshwater pool requires basic swimming ability (life vests often available for rent). Both solo visits and guided tours are popular, with tours often bundling transport; a typical visit lasts 1-2 hours, allowing ample time for swimming and exploring. Open year-round, the entrance fee is usually around 5 CUC/USD, with snorkel gear rental extra. It's advisable to bring your own snorkel gear if preferred, and be prepared for potential crowds, especially during peak tourist times; changing facilities and a snack bar are usually on site.