High speed Macau ferries take folks to Macau for Gambling. I think the trip is about 30 minutes from the peer in Hong Kong's Victoria Harbor to the island of Macau where massive gaming development is underway by Chinese and Las Vegas casino interests like Wynn, Venetian, and MGM.
But Macau is a lot more than gambling. The island offers a look back into the fascinating history of the Portuguese colony in the heart of the orient.
Here is the official Macau website: http://www.macautourism.gov.mo/en/