We are planning a trip to Greece for 9 days starting 23rd July 2018 with our children, 26, 24 and 21. After the island we will then have 2 days in Athens before 7 days sailing in Croatia. We haven’t been to Greece before and realize it will be a very busy time. We would like to find some nice beaches, good restaurants as well as some other activities. I am unsure whether we should visit 1 or 2 islands in 9 days and which islands given that it is a very busy time of the year. Any advice would be greatly appreciated.