I have the Canon 24-70 for the wide.
My main reason for going is for landscape photos. I'd just also like to be able to take some good wildlife as well. If it's not in the cards for this trip, then it will just have to wait.
The 24-70 should be wide enough on a FF for most use, on a crop it will be limited to wide vistas. Many of the areas where you want wide scenes have no space to back off, since you are on a boardwalk 8 feet wide. if you have a 18-55mm kiit lens, be sure to take it.
This was shot from the boardwalk at 28mm on my 5D MK II, or 17.5mm on a crop camera. Unfortunately, I had my 24-105mm lens on the 5D and not my 17-40mm lens, so I could not get some of the wide shots I wanted at that location.