I haven't been to Mexico, so I can't give you any advice on that.
but I did get married almost 3 years ago, and we went to Barbados for our honeymoon.
I had packed a photobag with my F3 and a few lenses, and on the way to the airport I realized I'd left it at home, but it was too late for turning back! Even though I only have very few photos of our honeymoon (shot with one normal disposable camera, and one underwater disposable camera (very cool by the way!!!)),
I hardly regret not having to carry around that huge bag of camera stuff.
and I'm very very sure that my wife enjoyed the honeymoon a LOT more without the camera, than if I had taken it... (which of course made the honeymoon a lot nicer for me as well: wife is happy=> I am happy
anyway, I'm not telling you to leave your camera, but I am telling you to rethink whether you're going on a siteseeing (and photography) trip, or on a honeymoon (or all the various stages in between)
I'd take the 12-24, for normal (of course extremely high quality) "holiday snapshots" and lots of pictures of the bride... ;-)
maybe the 28-70 (if you like that range for the shots mentioned above)
if you're staying in a safe hotel (a LOT of stuff gets stolen in hotels!!!) take your 70-200, and if you're going some place interesting where you'll use it, take it there too, but don't carry it around every day...
I don't know what your future wife is like, but I know even though my wife is very supportive & tolerant with my hobby, -> she'd accept and probably even appreciate all the pictures I'd take, especially afterwards, when we look through them, and reminisce about the holiday, but all the "hold on honey, I need to change lens", "can you just hold that", "oh wait, I need to get this" (put down the bag, get out stuff, put on the TC and the long lens, take a picture of a stupid bird on some stupid stone, miss the shot, then change lenses again, and put the bag on again) and similar situations (you'll probably think of enough yourself), won't make her so happy, which usually makes a holiday a lot less enjoyable (even if you're very egoistic, since her mood will DEFINITLY affect you!).
anyway so much for the advice about the wife.. ;-)
take your lenses if you can keep them somewhere safe. Insure them if you can (especially with the equipment that you have!!) - there are quite a few travel insurances around, but I have no idea about italy...
that way you don't constantly need to worry about your equipment, and can spend more time with your wife.
I'd probably not wear the camera around my neck with the big, shiny yellow and black "I'm so proud I have an Expensive Nikon D200 Professional Digital Camera"-camera strap when I'm in a place where I'd have to be scared the camera will get stolen (even though I do enjoy wearing that in safe places ;-)
but I usually tie that (or another less shiny) strap around my right wrist, and hold the camera firmly while I need it. (makes snapshooting a lot easier too!)
use a "normal" rucksack, which doesn't have "Expensive camera equipment in here" written all over it, with as few zippers as possible on it.
(if you want, check out crumplers foto rucksacks such as "the shrinkle" or "the puppet" they're pretty theft proof, but if you need anything from the bag, you'll have a problem too...)
anyway, I hope you can pick out the information you need/want out of my posting
have a great wedding!
theFool
PS. WOW! you have a 200-2400 lens?? where did you find that? how is it at the 2400 end? ;-D