Hmm...I'll try and help you by listing what comes to my mind below!
Hair gel if you use any
Tweezers - just in case if you get slivers
Tampons/pads - incase your period is unexpected!
Hand cream/ lotion
If you have sensitive skin then bring your own soap because the soap on ships useually dry out your skin real fast. Especially with those hand sanitizing stations everywhere!
Idk if you're aloud to but a curling iron if you need it
Socks - maybe a few extra just incase one pair gets wet
Casual jacket or coat incase it get's windy or rainy.
Hat or visor
Ipod/ mp3 - batteries for that
Mini first aid kit
Camera and charger or batteries
Money - in the right currency
Pocket hand sanitizer
Pocket sized tissues
That's all I can think of right now!