I'll be arriving at Santorini at 6pm on Jun 19 from Mykonos by ferry and leaving for Athens on an early flight on Jun 21, ie. only two nights in Santorini (or one full day)! Where shall I stay? Oia or Fira? I'm thinking of staying at Oia and go to explore Fira (and the rest of Santorini??) on the next day. But as Oia is best for sunset, I have to hurry back to Oia before 7pm. Does it sound reasonable?