I wouldn't consider going to HI for less than about 2 weeks. If it's only for a week, don't go, at least from the east coast. If you've never been, I'd go to Oahu for a few days and Maui for a week or vice versa. I wouldn't try to do more than 2 islands unless you're going longer than 2 weeks. Remember you can usually get better air fare with packages but you're not commited to be with the package the entire time. I think the usual is around 3 days hotel and car to take advantage of the package air fare. The problem is with II that Kauai and the Big Island will be the easiest trades so look for a direct exchange.