I will be arriving from the US to Mykonos in late June for 2 nights. We will then ferry to Santorini. Should I book ferry tickets now from the US?
Charles, You might find it helpful to have a look at This Website, as there's LOTS of information there on travels in Greece. It's likely that you can easily buy the tickets when you arrive in Athens, however if you're going directly from the airport to the Ferry, it might be an idea to pre-purchase tickets. I used one of the Greek travel agencies listed on the above website, and they arranged all my Ferry tickets as well as Hotels and transfers. A representative from the agency met me at the Ferry dock and provided the tickets on the day I left Athens. Happy travels!
When arriving in Mykonos, make your ferry reservations either at the ferry line office or an agent on the harbor, that should be sufficient time.