Boat trips are among the best things to do in Santorini.
The most famous tour is a 1-day cruise in the volcanic islands and Palea Kamini hot springs. During this day, you will explore the island of Nea Kameni and its still active volcano. You can even walk to the summit of the crater. You will also stop at Palea Kameni hot springs to take a dip. Then, you will end your day on Thirassia island, located right in front of Santorini. As these tours are very popular, you should really book yours in advance. You can also choose a luxury version of this cruise, on a catamaran. You will sail around Santorini, and enjoy 3 stops for swimming, including one at the hot springs. Snorkeling equipment is even included! At the end of the day, you will also admire the beautiful sunset from the sea.