Skiathos harbour is great janbabe, as is the Poporo in Alikes (thanks for the reminder pat.e10!).
However, I have to agree with greeklass - the stunning view from a little fish taverna in Thira, overlooking the Caldera at sunset.
The glass has just come from the freezer and sticks to the paper tablecloth; the beer is so cold ice forms on the outside of the bottle; the first sip causes an "ice-cream" headache!
Only 6 days left 'til Thassos...