Having narrowed down my first cruise to (likely) a cruise on Sky Princess to the Baltic thanks to some very helpful input in a previous question I have a specific question: Princess offers the Princess Plus fare which at 30USD per day including drinks package, wifi, speciality dining and crew incentive seems very good value. I think the crew incentive which is included in the Princess Plus fare pays for just the daily service charge. Assuming I need to pay extra for the tips for drinks and speci