We didn't bring centerpieces, decorations or anything like that either. We did the same thing as Chanti, we just picked a wedding package and made the decisions on cake, menu, flowers, etc once we got to the resort. It is definitely one of the perks to having a DW! The only thing we did was make OOT bags for all of our guests. That was actually a fun project which I really enjoyed doing.
Hope this helps!