OK here is a couple ideas for appetizers
Take some deveined shrimp, place a piece of pineapple in the little curve and wrap in a piece of bacon, toothpick to hold it together and grill. can do direct or indirect. Could make you a sauce to coat them with or better yet to serve with them to dip them in. these are awesome
Another unique one is scotch eggs the link below is to a recipe for them i really like, check it out, and if time is a factor you can icrease the heat on these quit a bit still indirect though, maybe 300-350. Do a test run of both of these you can adapt them and make them your own.
Also let us know what you decide to do, would love to see the menu