Per website, "Depending on the length of your trip, and taking geographic proximity into account, here are my recommended priorities.
2–3 days: Athens
5 days, add: Hydra
7 days, add: Delphi
10 days, add: Nafplio, Epidavros, Mycenae
12 days, add: Olympia, Monemvasia
14 days, add: Kardamyli and the Mani Peninsula, and slow down
More time: Head to Mykonos and/or Santorini, two of Greece's best islands"
RS says Mykonos and Santorini are two of Greece's best Islands then why doe she add them after 14 days if more time?