Frankly, I think the themed cabanas are -- to put it politely -- overrated.
We just got back from the HRH last week, and did Cabana #6 (non-themed) on Thursday 8/25. That and #5 are probably in the best location, set close to the pool but in a quiet, low traffic area, behind a wonderful grove of date palms - lots of shade and privacy, and right near the hot tub . There's even shaded pool area nearby in the afternoon.
The themed cabanas -- which with the exception of their backdrops are exactly like the non themed ones -- are all over in the crowded "rear desert" area, facing the backs of a massive sea of chairs. As my wife put it, they're "hot, with less attractive view and no privacy. Great combination."