You need to contact an attorney in Hawaii, preferably the island where the hotel is, and have him/her find out what is going on with the hotel. If they have filed bankruptcy, you may not have many options.
If they have not filed, it may be worth you filing suit in small claims court for a refund of the money paid. If they've accepted your money, it is a breach of contract on their part and you have the right to sue for a refund or specific performance, which is a request to the court to force the hotel to honor the contract - in this case to provide you accommodations at the hotel as reserved.
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