Should you be mulling over your options of settling down to your escape within marvelous Mirissa, then do give some thought towards a snorkelling expedition, and that too in the waters off Polhena Beach. The calm seas mingle well with the offshore coral reefs that beautify this stretch of coast in the country and thus, will prove to be a worthy investment of one's time and energy. Encounter schools of colourful fish coupled with scenes of astounding corals that would make for quite the beginning of your tropical holiday. Although, keep in mind that if you are holidaying in Sri Lanka during the monsoon rain seasons, then visibility will be at its lowest.