I am bringing chair sashes, raffia fans, shells and fake diamonds for the tables at dinner, and some fabric for the arch under which we will get married. Also considering personalized napkins, and some petals for down the aisle.
Previous brides at my resort said that the staff will set it up for me, but I will have to reconfirm that with the resort (and they dont respond unless your wedding is near hehe). If they dont, then I guess thats what the wedding party is for ;-) hehe.
I've been told to set up your decorations as you want them before you go, take a picture, and print out the pictures and give them to the wedding coordinator (or whoever will be setting it up). This way they can be sure that they aren't 'doing it wrong' , and won't surprise you on your big day.
I've also heard that some resorts will do the set up for you but require an extra fee.