There are several areas to explore around Yakima, nothing really technical or challenging unless it's in the snow, but it sure beat sitting on the couch... Ahtanum, Nile/Bethel Ridge, and the Naches/Manastash areas all offer miles and miles of two track. There used to be a decent website that had great trail descriptions and even a few maps, but my work computer isn't letting me access it anymore, but you can try it and see?