Hello I will be embarking on a cruise soon; however the ship does not have a dedicated chapel/room for prayer. Where would it be permissible to pray on the ship?

ב"ה Shalom, Assuming, there will be at least ten men on the cruise who will request a place for prayer you may join them in the designated room. Otherwise, the Rema in the Shulchan Aruch 94: 9 emphasizes the importance of praying in a place without distraction. You may pray in your bedroom but not opposite a mirror.( Mishna B’rura 90: 71) You should also be aware of praying in the proper direction towards Eretz Yisrael, depending upon the direction of your cruise, Eretz Yisrael is not always in the east. Chag Same’ach חג שמח