I would take my 5DIII, 16-35, and 50 1.4
That's it. Keep it simple and light and you'll be more relaxed.
In your case, I would suggest : 5DIII, 16-35, and 100L macro
That kit will not slow you down and give you plenty of good shots. Although I'd be severely tempted to tuck the 35 1.4 in the bag
I agree. Simple and relaxed is the name of the game while traveling. I rarely take the 24-105 off my 5D during a trip and if I do, it's for something with a bit more reach, such as a 70-200, when I want to grab animal pics at a zoo (Taronga Zoo in Sydney is awesome, by the way). That said, out of the lenses you have, I second the above --
5DIII, 16-35, 100L macro, 70-200 (if it fits and depending on interest) , and if you can squeeze in another prime, the 35 or 50 for very low light work or discreet street photography. At most