Weasie is right and especially on the weather permitting point. I've just come back from Santorini

- we were sat on the beach watching the water taxi coming in from Perissa and the sea was very choppy so much so that he tied the boat up and didn't do anymore runs that day. Business was back to normal the next day.
I think it's best to take the water taxi to Perissa because if you take the bus you have to go via Fira to come pretty much back on yourself.