Here's a couple snowboard benches I've made!
Step 1: Road Sign/Snowboard Bench
This one I made a few years ago the frame I made out of a sign post that someone downed. I painted the frame with cold galvanized spray paint. I used the existing holes on the sign then drilled the board to bolt it on, I'd recommend moving the frame out a little further (you don't want to jump on the end to quick or you might flip it over).