A deep-water canyon just offshore makes this one of the island’s best whale-watching bases, with blue and sperm whales reliably sighted within 20km of the harbour from November to April. Outside that window, Mirissa settles into a relaxed beach and surf town, its curved bay lined with cafes and a nightlife scene that comes alive after dark. It’s the anchor destination for our longest coastal resort stay, giving travellers five full nights to properly switch off after a busier first week inland. Beyond the whales, a short trip to Polhena Reef offers reliable snorkelling whatever the season.