Reviews: These links take you to tripadvisor.com, which is a very large and trusted online travel community. The amount of hotel reviews to be found here for every place on the earth is staggering.
Deals: More tripadvisor links - if you enter your departing and destination airport codes tripadvisor will tell you which companies are selling flights for those locations. The hawaii deals page is a huge repository of every possible Hawaii vacation offering you can imagine
Vacation Packages I like tripadvisor's vacation package links because a lot of them are by hotel, so if you know where you want to stay you can go to this one page and find the best price.
Hotel Lists: These links are to Travelnow's Hawaii Hotels lists. I have used travelnow (aka hotels.com) extensively. I've rented cars from them and hotels from them - and I have never had a problem getting my room or my car when I book through them. When I can't get a hotel room because they are all sold out (I always book last minute it seems) I go to travelnow and they usually have something - and the prices are almost as good as what I can get as a kamaaina (resident).
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