The CDC makes clear that it expects guests and crew, as well as port personnel, to wear masks in indoor and outdoor areas except for brief periods while eating and drinking and says that "removal of the mask for extended meal service or beverage consumption would constitute a violation of this Order."
he mask order includes while guests are seated in outdoor pool areas. If you are swimming you can remove your mask as long as you maintain social distancing of at least 6 feet --with the number of bathers restricted. Cruisers will not have to wear masks in their own cabins.
The CDC also suggests as a best practice that face-to-face interactions between crew and passengers be reduced "to the extent possible."
The CDC order requires social distancing of at least 6 feet "between individuals who are not traveling companions or part of the same family."
Cruise ships must also put in place crowd reduction measures in all areas where passengers congregate and high traffic areas such as limiting capacity in restaurants and entertainment venues. In theaters and casinos, ships have to provide social distancing between seats -- and "set up physical barriers where it is difficult for individuals to remain at least 6 feet (2 meters) apart."