We spent the day in Mykonos on our Mediterranean cruise in 2013.  It is a pretty little island and one of the things it is known for is that virtually all the buildings are painted white. The island itself is pretty plain with no real landmarks or specific things to see.  It is a popular place to go for the beaches and the nightlife is supposed to be pretty lively.  We just did a basic tour of the island and got a good feel for it.