My boyfriend and I will be in the Greek islands for 8 nights in June, and would like to split our time between 2 islands, one being Santorini. I've heard amazing things about Cephalonia too, but its pretty far from Santorini. Are there ferries that could get us there from Santorini, or would we need to fly? I'm not sure that 8 nights/9 days would be enough time to travel between the two since there's quite distance between them. Thoughts?