We did our honeymoon on the Eclipse, one of the Solstice-class. Yes, if you have the classic you can upgrade to the premium for the different per day, it was $11ish I think for us per person per day? And that's not just booze, that is "if it is liquid on the ship and under $15, you can have it." So fresh squeezed orange juice with breakfast, premium coffee or tea from the coffee shop, smoothies by the little spa food area for lunch, wine with dinner, $15 cocktails from World Class Bar (try the Zacapa Old Fashioned!), bottles off water off the ship for excursions or in our room at night. It completely paid for itself many times over so you should totally do it.