From Colombo drive for about 6 hrs towards the south end of the island.
Caryy all your lenses. Srilanka has everything - Landscapes, architecture, wildlife and Birds, not to forget the Blue whales and spinning Dolphins.
The Yala National Park of Srilanka, known for it's leopards also has an amazing variety of birds residing and migrating though it there. Be prepared for a trip of a life time. This painted Stork flew at a considerable height over us which surprised me.