While in Mykonos, I think it's a must a visit to the Island of Delos. It's uninhabited, and wherever you look there are ruins reminding what Delos was in the ancient times. The stone path up to Kynthos mountain is something you'll remember. From Kynthos' top, the view of Delos & the close by Rheneia Island as well the Aegean Sea is breathtaking.

http://www.fodors.com/world/europe/g...kythnos-607687

https://www.pinterest.com/pin/231091024599555649/