Awesome Dad Builds Backyard Roller Coaster for His Two Kids - My Modern Metropolis
Cut open the cardboard box so it is flat. Cut out the shape of your roller coaster seat. Also left the side flaps to fold and be the side of the coaster.
Instructions for Building Model Roller Coasters
Genius pretzel roller coaster for at least an hour (or more! Use all kinds of crunchy snacks.