1. Spend a week in Nuwara Eliya - it's absolutely beautiful.
2. Visit a tea plantation/factory. I went to the Mackwoods Labookellie Estate. They provide all guests with a tour of the factory and free tea tasting.
3. Visit Ramboda Falls: http://www.rambodafall.com/
4. Climb Sigiriya (lion rock) - Must do! about 7 years ago