Unawatuna is one of the biggest tourist destinations in Sri Lanka and is the most “famous” beach in the country. Unawatuna is very popular with travellers. The best time to visit Unawatuna, Sri Lanka would be from December – April, and from July until the end of September. Unawatuna Beach is really beautiful, with great swimming. The main beach at Unawatuna is the most popular among tourists and locals. the beach offers many water activities for you to indulge in.