I think @Craig1234 has the right idea, rather than risking cameras on the balcony and potentially getting kicked off the ship, just leave the balcony doors open. You will have the element of naughtiness by the chance of others heading you but you shouldn’t get into trouble.
Make all day your foreplay. Cheeky bum grabs, under the table gropes, sexy lingerie. You can go back to your cabin for a quicky anytime.
If laws allow, definitely pack some toys. Some vibes, some bondage equipment. But exercise a bit of discretion. You don’t want your room stewardess having to clean up your toys and restraints.