Hugo nominee: Deathworld by Harry Harrison, 1961
My view: Considering how much danger Jason dinAlt is put in in most chapters of this book by the flora and fauna of Pyruss, a description consisting of the phrase "action-packed" seems more than a bit inadequate. The action doesn't let up a whole lot (which is the point, obviously) and Deathworld is probably one of the best examples of this type of SF that I've read.
Nuggety?: while it seems to meet some of the qualifications of what Brad Torgersen thinks is traditional, action-based SF, the big reveal concerning why Pyrrus is so dangerous isn't one likely to please him. Even more than Joe Haldeman's The Forever War, there's a message buried in the action that's far too complex and ambiguous than "let's go kill us some BEMs!";