Might be late but it is probably worth saying anyway; in my humble experiences, many of the Australian hops are good for tropical flavors. Which seems almost stereotypical when I think about it...but anyway, there is a hop not mentioned yet called Motueka which imparts great lime, mango, and pineapple notes.
The last thing that I will mention is that I often dry hop with Chinook for grapefruit. For some reason I find that it is very noticeable when used this way.
Tap: The Monolith American Barleywine, Verdant Lager
Primary: Tharsis Belgian Strong Dark Ale, Jupiter Dusk Peach Cream Ale
Secondary: Corpse Rouser Imperial Oatmeal Stout, The Thresher Weizenbock, Artemis Vanilla Cream Ale