Skateboarding. First make sure you have a flat,smooth place to ride.
Boxes: TO make a box take a piece of plywood and blocks of wood how ever hight you want them and nail the plywood to the blocks this makes a box. To make a rail on the edge of a box find a piece of pvc piping and nail the ends to the box.
Rails: For rails all yoiu need is a medal or plastic rail.
and you can do wonders wtih them. YOu can start on the ground and build your way up.
(Jumps will be coming soon)

A picture of the insides of my jump