Being on the water is just apart of visiting the Greek Islands. Everytime I visit a new island I like to take a boat trip to see parts of the island you don't get to see on land.
I always suggest going for the Sunset cruise since its another great way to see a magical Santorini sunset without the millions of people crowding the steps! My other favorite way is the restaurant Naoussa that I mention in this guide too.
This company has half day and full day cruises, you can join a shared boat or book your own private rental. They'll take you to all the classic spots like white beach, red beach and the sulfur area. Just be careful swimming here if you have a white bathing suit on - it'll add color!
I always have a good time with them, the boat comes with open bar too!
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