if you are nature lover, you must go in Royal Botanical Gradens in Peradeniya
you can see wide varity of trees and plants.
Temple of Tooth Relic is a land mark of Hill capital - Kandy.
Don't forget to visit inside and worship tooth relic of Lord Buddha. walk around whole buliding and watch its architecture
its 10 days very colorful procession. you can see elephnats, traditional dancers and drummers and much more
It's interesting to stroll around the old grounds. There is a church near the temple and other interesting buildings and a big tree.
Visit a Hindu Temple, like for instance the Sri Selva Vinayagar Temple in Kandy. Hindu temples are totally different from Buddhist temples.
One of the most well-known religious sites in Sri Lanka. It is possible to take photographs inside if you buy a special pass (approx. 100 rupees).
2 day trip to Kandy. There are lot of travel agencies which will arrange these trips. Or you can stay there longer time if you wish.
A little bit cooler climate than Negombo.