One down side I see, is the royalty free part to the images. They are offering just a few hundred dollars in prizes, and in return, possibly getting thousands or tens of thousands worth of images free of charge, that they can use indefinitely for any publication or artwork.
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5. By entering the contest, you grant the U.S. Forest Service a royalty-free, non-exclusive, irrevocable permission in the photo(s) to use, reproduce, prepare derivative works, distribute copies to the public, and display publicly, in any media, and by any manner and means, now known or hereafter devised, worldwide, for U.S. Forest Services purposes. By entering the contest, you agree that it is your sole responsibility to obtain all permissions necessary to grant these rights. The images must not have been previously published in any publication.
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