Mirissa is a popular destination for whale watching in Sri Lanka. The best time to go whale watching is from November to April when the sea is calm. There are several operators that offer whale watching tours in Mirissa, with experienced guides and boats equipped with safety gear.
During the tour, you may spot blue whales, sperm whales, orcas, dolphins, and turtles. The tour usually lasts for 3-5 hours and includes refreshments. It's important to follow the guidelines given by the operator and respect the animals' natural habitat.