Edit to make it cheaper, make/bring the food in if they let you. Bring
mini hot dogs, chips, palm tree shaped sugar cookies you make & frost
yourself, surf board crackers & cheese, buy a shell to serve chips out of.
Hawaiian punch.
Grill some chicken breasts, cut them into big bite size pieces, stab them
w/a skewer & add a diced cube of grilled pineaplle. Stand them up on a plate, serve them w/teriyaki sauce/glaze & bbq sauce for dipping.
Pigs in a blanket served on a ring of grilled pineapple
palm shaped sugar cookies
Make ham, cheese & turkey, cheese sandwhiches w/flat bread then cut
them w/a tiki metal cookie cutter
Bowl of Hawaiian punch
Teriyaki meatballs
Mini egg rolls served on a mini surf board plate
Decorate each plate of food w/one of those edible flowers (in refrigerated veggie section of groc store)
Volcano cake
Surfboard or flip flop cookies
Put all the food out on a surfboard table (cut out a piece from plywood & paint)
Get mini iced donuts in colorful colors @ the donut shop & stick a drink
umbrella in each one
You could cut fruit in slices then use a star fish cookie cutter to punch out the shape from the slices
Put a grass skirt around the serving table
potatoe salad & lots of diff chips (not luau themed but good to have on hand)