Located in the Casino de Montréal, Le Pavillon 67 spreads an excellent buffet. On weekends, you'll find lobster, crab legs, poached salmon, roast lamb, grilled shrimp and many other appealing dishes. The options are more limited on weekdays. On Sundays, there's also a decadent jazz brunch with live music. Note that the casino does not admit children under 18.
Very few places offer food on the two Parc Jean-Drapeau islands. There are several other eating and drinking spots in the casino: Ajia serves Asian fusion and is open hours similar to Le Pavillon 67; L'Instant has sandwiches and other deli fare, and is open 24 hours; there's also sleek modern Bar Le Poker, open from 11am to 3am (with food served until 2am).