There are numerous bodies of water in Sri Lanka, each with its own beauty and ecosystem. When you're in Hikkaduwa, find some time to go on a river safari. While the beaches are enjoyable enough, there's something about the calm, yet murky, waters of the river that is both exciting and mysterious. The Madhu River is the most popular option. Keep an eye out for various birds, fish and maybe a crocodile or two, sunbathing in the corners.