請教對Greece熟悉的大拿們。。。

We are planning a two and half week trip to Greece starting from the second week of April..Here is a tenetative itineray I have come up with:

04/07: Arrival at Athens (likely early evening arrival)
04/13: Taking ferry to Naxos (early afternoon arrival)
04/15: Leaving Naxos by ferry for Santorini (late afternoon arrival)
04/17: taking ferry to Crete (early evening departure and late evening arrival)
04/21: flying back to Athens
04/22: flying back home

While in Athens, we also plan to do a few day trips to visit Delphi, Mycenae and Eleusis.

We are not planning to rent a car, so we will have to rely on public transportation or taxi. Not quite sure if it would be convenient, especially with two kids (7 and 10 at that time)

Comments? Any input would greatly be appreciated. Thank you very muc!!!