Three places come to mind for Wonder Martini's -
If you're looking for a sweet version - Pistachio Martini in Suite Lounge, Cotton Candy Martini in Wonderland, Chocolate Martini in Casino - Espresso Martini in Casino.
If you're looking for just a gold old fashioned martini - Favorite places are Mason Jar, Pub, or Suite Lounge
As I type this... I just realized how many martini's we've drank on a cruise... OOOPS