You should have 3 Formal nights on cruises longer than 7 nights. All the rest will be Smart or Elegant Casual. That is the itinerary I want to do next. Let me know how you enjoy it. We have had land vacations on the Hawaiian Islands twice, so am now ready to take the cruise experience as that is the best way to travel. If I can help with "what to see and not miss" recommendations, please feel free to email me.