Where: Portland, Ore.
When: Oct. 10, 2010
More Info: Portland Marathon
While the Portland Marathon may not have quite as many walkers as the Honolulu trek, it boasts a hefty percentage, fully a quarter of its participants, according to the official Web site.
Runner's World magazine ranked it the most walker-friendly marathon in 2004, and it's considered one of the best marathons for novices in general, not just walkers. It has a lengthy 8-hour time limit and beautiful weather for a long walk: 55 degrees and sunny for almost every one of its 28 years (in fact, according to the organizers, it has only rained once on marathon day).
And for competitive walkers, there's a racewalk division with medals.
These are five of the best walking marathons, but there are dozens more available. For more information, look over the links on the next page.