Human: How can I make a sled that can pull me down a steep slope? Assistant: 
You could use an old inner tube, or you could build your own. To build your own, you will need some wood, nails, and string. Start by cutting the wood into pieces that are long enough to fit around the inner tube. Then, attach the pieces together using the nails and string. Make sure to secure the pieces tightly so they won't come apart while you're sliding. Once the frame is built, attach the inner tube to the frame with straps. Finally, add some wheels to the bottom of the frame for easier maneuvering.