That blows man. I agree with the fiberglass casts completely. I wish I knew about those last year when I broke my arm.
Props for hitting a box your second day, too! Pretty ballsy and not really recommended but it's definitely respectable. Depends on the severity of the break, but if your doctor says its cool you might even be able to ride with the cast on. My main advice is not to let this scare you away from boarding.
2011 Never Summer Revolver-R 156
2011 Flux RK30's
2010 Rome Libertines