All restaurants, except Emeril's have no strict dress code. Your park wear is fine. At Emeril's, no tank tops/muscle shirts are allowed.
The best restaurants are: IOA-Mythos, Burger Digs, Enchanted Oak, Thunder Falls Terrace
USF-Lombard's Landing, Finnegan's, Louie's, Richter's, Schwab's Pharmacy
Citywalk-NBA City, Margaritaville, Pastamore, Hard Rock