It appears the Seafood Shack on the Oasis will cost you. $7.95 per person for lunch, and $9.95 for dinner. Children 13 and under eat free but must be accompanied by adult. They also have restrictions on the menu. For the basic cover charge you get to choose 1 appetizer or soup (not both), 1 entree, and 1 dessert. If you want more you have to pay $3.50 per item.
I'll be interested to see if this portion control or pay more process extends to Johnny Rockets, which has always been order all you want for the cover charge.