Halong Bay is located in the northern part of Vietnam near the Gulf of Tonkin. It is one of the most popular tourist locations in Vietnam, and has many beautiful sights to see. If you want to come visit the area, you need to think about the best way to get there. Many tourists choose to fly into Hanoi, and from there they make their way to Halong Bay. There aren't too many trains that go in the direction of Halong Bay, so you would probably have to take a bus. This is a very popular method for getting around the country, and it shouldn't be too hard to get a bus ticket when you get to Hanoi. Vietnamtripadvisor can arrange a private car for you from airport to Halong Bay, hotels booking..., though this is an option that is used much less than anything else. It can be hard to drive around in Vietnam, especially if you don't speak the language. Many times, travelers will have guides take them around. This is probably the best option for you. It assures that you will be going in the right direction, and you don't have to worry about the language barrier with the locals.