We plan on having a luau theme reception, do you have any ideas?

You could serve pu pu platters of food, or have a pig roast or fish, or platters of fresh fruits like pineapple and mango, etc. Kabobs work well also, with pineapple and meat. Drinks could include mai tais or other tropical drinks with small umbrellas. You could rent some tiki torches and/or palm fronds for decorations and give out flower or shell leis as favors at each table. A fun conversation piece could also be an aquarium or gold fish bowls at each table, or shells and sand in bowls/trays/little sail boats. Music could carry the theme - Hawaiian or luau appropriate music.

You could include a note in the invitations, telling your guests its a luau and some may dress accordingly. If you want to go all out, you may be able to get lots of inexpensive grass skirts for your guests to wear over their clothes.

You could also hire some local dancers to perform a hula or other fire dances or stick dances, etc. (perhaps dance clubs or a local cultural center could suggest who would know these dances).