Ranma ½: Hot Springs Battle Royale!

SINOPSIS

A hotsprings resort is having a big obstacle course race as a PR gimmick, with the first prize being a trip to another resort of the contestants choice. Seeing a chance to get back to Jusenkyo, the whole gang enters, unaware that the resort is trying their best to stop anyone from winning, since they're broke and can't afford to pay for the prize...