Be creative, have a luau, cook up some steamers, play the beach boys, surf in your tub, it's all up to you. You should do everything humanly possible to help your guests forget that beyond your front door is hell freezing over. The Beach Boys. This should really be a no brainer. Hamburgers and hot dogs are a must.
Chips are good too, but no dip.
A watermelon is a must as well, but may prove to be more then a bit difficult to find. Fruits like bananas, oranges, and pineapple should be about as well. Lot's of clams. Put them in a large pot and feed them corn meal to help clean and fatten them up. The day of the party, simply throw them in a pot and then boil them alive.