So about this theme...
It's a convention-style hotel, so goal is to make it simple and appeal to everyone - however there is a theme there. Basically, the hotel takes over an old age rum plant in the Caribbean, which are known for it's "Falls". So they have influences of the old rum era, with the styles of a new modern hotel. The conventioneers Universal is trying to attract probably won't care as much about it, but there is something for the fan who likes "backstories". Hell, Strong Water also has a story too. (I didn't read it, too busy getting my Mule on.)
Also doesn't help that a few things are missing since they cut it real close.
You may not like that explanation, but that's what it is.