Karen:

We took this Crystal cruise last year and used their airport transfer service at the end. Although it sounds expensive, it is a reasonable value compared with the alternatives. Venice is a very expensive city. In addition, you can rely on Crystal to ease your luggage handling(they'll load it on and off the airport bus that picks you up in front of the ship) and they will make sure that you get to the airport in ample time.

Planning to spend three days in Mykonos and three days in Santorini next March following a Crystal cruise. Does anyone have any hotel and/or guide recommendations?

Jim