Drive for about 6 hours from Colombo towards the South of the island.
Be prepared to want to extend your stay as the country has a rich wildlife store and some amazing landscapes to photograph. Carry all types of lenses. Every one will come in use between the wildlife, landscapes and architecture.
Srilanka's Yala National park is know for it's leopard population, but also has a large variety of birds residing in it and migrating thorugh it too. I always wanted to get a peackok in flight which I finally got here.