I would leave ticket prices alone, drop the parking fee, only offer a pass discount at selected places that tend to be less busy, drop food and drink prices somewhat, but still enough so they're making a good profit (souvenir cups still need to be a better deal than buying drinks in paper cups), and no longer allow previous year's cups to be used, but lower the refill price to $.99 or so. Also, I'd add more perks for the employees, as it makes them happier, and that happiness tends to rub off on the guests.