I joined the tour on early December with my friend. It was easy to book as well, just send them an email and pick up and drop off transportation from Hanoi could be arranged. 3 days 2 nights is enough to spend days in Halong Bay, nothing much to do, besides kayaking, enjoy scenery and fishing at night. We meet up with new friends on the boat as well. They also organize Vietnamese cooking class on the boat. Dinner and lunch were organized and presented