We are in Santorini 1 day off a cruise ship. Booked the ship's 8 a.m. tour for Akrotiri, which ends in Fira about 12 pm. Then, want to make our way to Oia. Do we take a bus or cab? Prices we should expect to pay? Assuming we arrive in Oia, then what? Where should we have lunch? We are a middle-aged couple - we want pretty views, photo opportunities, and a nice place to eat lunch. Then we have to get back to Fira and down the cable car to the cruise ship. Advice?