Besides the entry of $15 on Sunday be sure to bring $7 for the Launch fee. I don't know if it has been mentioned before but it is $7 to Launch.
In addition, there will be WL.com apparel and goods to buy at the BBQ, so stock up.
ohh that's an important note. I have started to keep 'emergency cash' in the truck just in case I forget to bring cash. This dock does NOT accept credit cards yet like Coulon (doh! welcome to 2009!!) so cash or checks! Neither of which do I normally carry....