This is a guide on how to build a mini skate park out of cardboard. Its a super fun project and anyone could make this at home.

Supplies

Cardboard
Produce box (or any decent sized cardboard box)
Pencils
Small clip
Parcel wrapping paper
Packing tape
Hot glue gun

Step 1: The Base of Your Skate Park

Cut the front side off of your cardboard box to make the park more opened up and easier to access. I didn't use any pictures for this one because I think its pretty self explanatory.

Step 2: Building the Half Pipe

Take a large circular-shaped object and trace it on a piece of cardboard for the curve of your halfpipe, repeat this step 4 times for each transition of the halfpipe. Cut out your transitions and tape 2 of them on each side of a small cardboard box (this will help support your halfpipe so it doesn't cave in). Glue or tape your two smoothly cut transitions directly across from each other in two separate corners of the box. Next, cut a piece of cardboard large enough to fit on the transitions.

Step 3: Making the Half Pipe Smooth

Cut out some parcel wrapping paper the same size as the cardboard top to your halfpipe (do this by putting the parcel paper on top of the cardboard and tracing over it). Put some glue in the center of the halfpipe to avoid air bubbles and tape around the edges. Make sure to spread the glue out evenly so you don't have chunks of it under your smooth surface.

Step 4: Building the Quarter Pipe

Cut a triangular piece of cardboard about the length of a paper towel roll (look at the picture) and glue it to the right side of the halfpipe. Then cut in a straight line through your paper towel roll so it can be flattened out. Tape the paper towel roll to the cardboard support giving it a smooth surface to ride on.

Step 5: Building the Rail

Use a small clip and tape it to a pencil to give your rail some height, you should also glue the inside of the clip so it doesn't open when in use. Then glue it on to the floor of your skatepark.