Greek travel Itinerary advice

Hi all

I am planning the following itinerary for 5 days this month, please let me know if I missed any major attractions

1) Classical Greece 3-Day Tour: Epidaurus, Mycenae, Olympia and Delphi from Athens 2) Acropolis and Athens full day tour + Food tour 3) Hydra, Poros and Egina Day Cruise from Athens

Thanks,