Beware. Travel time from Ho Chi Minh airport to this hotel is 5 hours by car which is almost as long as the flight from Melbourne, Australia to Vietnam.
You need a Vietnamese government VISA to travel to Vietnam and you will not be allowed on the plane in Australia without a VISA letter. Once in Vietnam, you will need 2 passport size photographs to provide to customs as well as your VISA letter so they can process a VISA for you at the airport.
In my case, the VISA letter never arrived in time so I was not allowed to board the plane in Australia and lost the whole hotel money (you pay the whole amount of your stay upfront in Ocean Dunes Resort), as I had to cancel flights and hotel due to this.
Be careful as the management at this Resort will not contemplate any requests for money back, whether you paid for a week's stay or 2 month stay..no matter, you will loose all of your money.