Thanks for the advice!

I just may have been trying too hard to pack everything into this trip. Here's how the itinerary looks like currently:

Day 1 - arrive in Athens around 5pm
Day 2 - Athens (daytrip to Delphi?)
Day 3 - Athens to Santorini late afternoon flight
Day 4 - Santorini
Day 5 - Santorini to Crete afternoon ferry
Day 6 - Crete
Day 7 - Crete
Day 8 - Crete to Athens, afternoon flight
Day 9 - leave Athens in the early am

Look liks it could be difficult to go to Meteora then. How about Delphi - would a day trip work (and would you recommend going)? Quite excited to go see the navel of the world. Any other places not to be missed (Knossis, Acropolis, Nat Archaeological Museum)?

Thanks again for all the help!