★第59回「お好みマラソン（150分間）」※東温市ダム湖畔コース 2026

Beside the dam lake, the 59th running of this unique okonomi-style race feels less like a stopwatch duel and more like a runner’s choose-your-own-adventure. The ★第59回「お好みマラソン（150分間）」※東温市ダム湖畔コース emphasizes the idea that “okonomi is best”: run as much as you like, however you like, and keep it cheerful. The course follows the dam lakeside route, so the day is built around looping or moving along that waterside setting at whatever rhythm suits your legs. Beginners and families should fit right in, because the whole concept is a “carefree okonomi run” where you enjoy yourself fully at your own pace; the added quirk is the participant-only “Easier than now! class” for anyone who wants a little help making running feel less hard.