OK, this race is in a place where I used to live, so I may be biased, but consider the facts:
1) a fast, downhill course
2) very scenic surroundings -- seriously, just spectacular
3) no crowds, but plenty of deer, birds and natural beauty to spur you on, not to mention the guys at the aid tables and on bikes patrolling the course
4) well stocked aid stations, regularly spaced
5) hands-on attention from a well-organized race director -- one of the best, and she's a runner
6) great pre-race speaker/easy packet pick-up
7) in addition to classy medal, a long stemmed rose and a moistened, lemon-scented towelette at the finish line
8) finish in a park with party
9) neat awards
10) incredibly interesting & supportive running companions!