Definitely free and easy for me. Younger kids tends to tire out more easily due to the curiousity of new environments and so many things to see and play so they might sleep more in the morning. If you follow tours, they usually gather quite early and if you miss the bus in the morning, it’s as good as free and easy for the rest of the day or till they reach hotel for dinner etc. Not to forget, tours although covers more places, it’s very rush and tiring, especially with young kids.