Meet the Trideck: a 3-wheel skateboard you can ride on grass, gravel, and other surfaces. It comes with air-filled tires and a brake pedal. Trideck has lightweight aluminum wheels, an aluminum brake pedal, a steel tube frame, and a detachable joystick handle. You also get a steering tension turn-knob for quick adjustments.
The Trideck gives you the feel of a skateboard but offers great roll and shock absorption for a comfortable ride. The above video shows how it performs. You can get yours here.