fix the bowl, there are some holes in the transitions in the deepend that need replacing and the coping needs to be painted and bondoed again if you want it to last.
lower the price. $8-10 sessions would be good, i would go there more, but with the current price i cant afford to. especially people who come from distances to skate, they have to pay toll/bridge fare and then $13 on top of that. Paying $13 to skate and then having to mop the bowl myself is not very fair either.
hook that "state of the art" sound system up you guys spent so much money on, or sell all the equipment and get a pro shop/snack bar... or build more terrain.