In and out of the ancient cities and all along your travels, you will pass immense statues, temples large and small, huts, green villages, jungles, rice paddy fields, cashew crops, animals... you could spends weeks just exploring the ancient cities, hill country, Kandy.
You can spend your entire trip trying to fit in everything you have to eat: fresh fish and crabs straight from the sea, epic breakfasts at someone's home and dozens of street food specialties. And you should.