Skaters and bikers coexist mostly happily at Dirtwood Ramp Park. Less than a year ago, Jay Evans, 24, rented two Garden Oaks warehouses that combine into 15,000 square feet of riding space. In an effort to keep patrons challenged, he and his friends regularly change the layout of the ramps and rails, including the only spine ramps and wall ride in town. The one constant: All of the ramps flow together, so bikers and skaters alike can make a continuous loop around the park -- that is, unless they fall on their asses. If your ego gets bruised and you need a break from the action, Dirtwood has sofas on top of the ramps where you can hang out and laugh at your friends as their bodies slam against the floor.