My experience on Silver Seas was incredible! We did have an active cruise itinerary with people younger than normal. The dress was much more formal than other ships we have been on. Most every night was semi formal (jackets and ties for men and nice dresses for women). They did tell us ahead of time how many formal nights (3 or 4 at that time for a 14 night cruise) on a couple of casual nights and the rest were semi formal.