That video is excellent. Great perspective, editing, and sick tricks!
If you guys have a Fry's electronic store in your area, retractable monopods are sold there for $15-$20. All you'll need after that is the GoPro Tripod Mount ($5-$10).
This is the one I purchased:http://www.frys.com/product/6486762?site=sr:SEARCH:MAIN_RSLT_PG
I'd recommend finding a way to make it float in case you drop it.