Zodiac departure is about mid ship usually on the port side on the 3rd floor. Also on the 3rd floor are 2 rooms for boot storage and cleaning along with all the kayak gear. You can also store other things like hiking poles with your boots.
Parka exchange is easy as it getting boots that fit.
In general it's a very relaxed vibe. Especially during the day.
Dress is pretty casual in Collonade. MDR, gents in collared shirts, occasional sport coat. Ladies in nice blouses and as some else said "fancied up black pants" 😀. There were 2 formal nights where folks spiffed up a bit. About a dozen tuxes appeared with accompanying dresses. But the more casual folks were not out of place. Occasional pair of jeans. No one looked mass market sloppy.
You're going to have a great time!