It's difficult to answer to this question in one sentence. There are many reasons to do that. You can see the ancient world with the buildings before our century. It's hard to beleive, but there is a lot of buildings in Sri Lanka wich was build about 200 or 300 years before our century and they a still in quite good conditions.
Or you can watch to lot's of famous Buddha statues all around the Sri Lanka. You will lot's of them there. All sizes from smallest to 40 meters, made of stone and gold, wood and bones.
You can ride a beautiful elephants in Sigiriya. Elephants was a domestic animals in Sri Lanka, but right now the Sri Lankian law forbid to have an elephant as a domestic animals. It means that all elephants that local peoples have in their houses is the last domestic elephants on Sri Lanka. 10 or maybe 20 years, and all of them will die. After it only wild elephants will stay alive in wild nature. No more private rides, no more funny jokes. It's you chance to make a ride and to catch it on video Maybe your children will not have so nice ride, Cause no more elephants stay alive.
And of course you must visit the real Jungle Beach of Unawatuna. It's a really wild place ! The only way to get to the beach is a boat. You need to arrange a private trip to beach and back. It will cost you about 50$-80$ but it worst it. When I've been there in March I saw nobody there, only our company of friends a Lankian guy who take as there.
