Phil:
If you are fair and concerned about the sun, all I can say is that you should do everything and anything to protect yourself on the PG.
It is a wonderful ship & you will have a great time.
BUT
Shade on the open decks is a rare thing
Silly hats, towels, whatever..... do respect the sun.
I remember telling my bride on day one to watch certain people on day 3 because they will be lobster red by then. Imagine pouring on tanning oil & baking in that sun!
Phil: be smart & you will be ok.
Doug