I am tailoring a special trip for expat in Hong Kong to Hanoi and Ha Long Bay (Vietnam) with only 305usd/per person in group of 2 people for 3 days 2 nights. The more people in your group, the cheaper it is. If you need more info of the detail itinerary as well as cost applied for your group(more than 2), please do feel free to drop me a line or chat with me on skype at chuckeechuckee. Thanks for reading this post and have a nice day. Phuong.