I brought a bunch down this last september too. The parks won't take them, however the hess stations that are on property (one near magic kingdom, one across from downtown disney and one near the boardwalk) will take them. We went the first night and redeemed a few of them each, cashier hadn't seen them before the other cashier told him they were manufacturer coupons and ok to take. We also bought a 12 pack cause pop seemed really cheap there and we were staying for 9 nights. The prices on pop and water at the Hess station was not jacked up for being on property.