Kindly skip the cruise for Sunset .. it' will be better if you climb on the top of the Santorini ..there is a dedicated space where people gather for the sunset view ..
Nonspecific reason as such .. the price is high and on the top of the Santorini where you have the place for seeing you an capture the whole view of it not only sunset . I have uploaded in IG handle .. #rahulmig
Different answer but try the photoshoot tour if visiting with your loved one
Any reference who can do it at reasonable cost?