State Highway 238 on the eastern outskirts of Maricopa County is perfect. The sparsely populated stretch between the town of Maricopa and the Sonoran Desert National Monument is scenic, unincorporated and rarely patrolled by police, who have better things to do than scout for speeders on a highway that leads nowhere. The biggest obstacles are garbage trucks going to and from the Butterfield Landfill, but once you're past the dump, you can really open it up. This isn't twisty territory, nor is it a yawner straight shot -- there are just enough turns to keep it interesting as the roadway's width shrinks in direct correlation to your speed. An ideal side trip on the ride to Tucson.