Don't know what happened to the previous poster-think he got taken. Went to HaLong Bay
last month and hired a boat for less than $80. The entire boat for our group of 10. They took us where we wanted to go on a route that was ahead of all the other tours. A great time and included a super meal. This is one of the 10 best places that we've been to and worth the ride from Hanoi.
HoiAn was beautiful at night and a great side trip for two days.