What to visit between Cochin and Thrissur?

Hello everyone, Second time in India with the family of my wife. They are keralites from Karoor, near Chalakudy. This is my second time here, we have already visuted Atthirapilly waterfalls, fort Cochin, guruvayoor temple and elephant shrine and watched kathakali show. We will visit Munnar this time. Any more tips of places to visit?