In Kandy visit the Peradeniya Botanical gardens, Temple of the Tooth Relic and seeing the Holy Temple of the Tooth as evening falls and the local Buddhists worship through bearing gifts of fruit to the shrine.
You can see the lovely views over the lake and city and the chance to see monkeys playing on the rooves of the houses below (we can not guarantee the monkeys) . It may also be possible to see a Cultural Show although these do get very mixed reviews on Trip Advisor.