Go all out and get a pig roast! Lol. If not, definitely serve pineapple-style dishes. Can't be a Hawaiian party without it. Or serve pork, Macademia nut vanilla chip cookies, Polynesian meatballs made in the slow cooker with Hawaiian style barbecue sauce, barbecue pork, coconut, tropical fruits, like melon or mango, Poi, or even SPAM burgers topped with pineapple, (SPAM is actually big there)! As an appetizer, you could serve ham and pineapple pizza bites. For beverage, you could serve alcoholic and non-alcoholic versions of Pina Coladas, or Blue Hawaiian drinks. But definitely focus on pineapple dishes, like pineapple pork, or make pineapple drinks.