While the 24-70 II is my most used lens, I think the 70-200 II is my favorite. I get a little excited each time I use it. It will be on the trip. I've been trying two things to mix up my waterfall shoots, trying to capture the entire scene and not just the waterfall and isolate interesting portions of the falls. So far my attempts are not as good as yours in trying to isolate portions of the falls. But it does bring in an addition level of interest as you look for something that may work as a stand alone picture.
Huh......see...that is why I post questions.......anyone know of someplace that rents the wonderpana or equivalent system for the Rokinon 14 mm?
BTW....Big waterfalls get all the glory and can make for great pictures. But I tend to favor smaller falls. Not only do they tend to have a lot of character, but, also, less spray. ;-)