The Symposium Cultural Center is a fantastic place to go to when youre visiting the island. You will have access to everything from Greek food, art, history and culture through exhibitions and workshops. If you like hands on activities, I highly recommend that you sign up for a workshops with your friends or family when you visit. It is a great bonding activity and a nice way to experience all that Santorini has to offer. Here is the website and some links
While on the Greek island of Santorini, consider spending time at the Symposium.