"These crystal-clear waters, served by both the sea and thermal springs, maintain a year-round 28C and allow underwater life to flourish to the point of distraction: garra rufa fish provide a natural pedicure while the Paranemonia vouliagmeniensis, a local sea anemone, is a visual delight. Entrance to the lake is costly but can be combined with lunch or dinner on the wooden deck overlooking the water. If you’re feeling active, choose between aqua aerobics, hiking or snorkelling."