Being on Syrena is like having your own floating 4 star hotel in one of the most scenic places on earth. We originally booked a cheaper cruise but got upgraded and I am so happy we ended up with Syrena and would happily pay the full price for the level of service and quality of the experience.
The rooms are spacious and clean with beautiful showers and nice windows and some have balconies. The restaurant is on the top deck and each meal was carefully prepared by the on board chefs and included Vietnamese and international dishes.
In terms of the activities you have to realize every cruise follows the same itinerary so I would base my selection on comfort and level of service. I would recommend doing at least a two day/one night cruise if not longer since it is a 4 hour drive from Hanoi. Some may say the whole experience is tacky but I would still recommend it as the best way to see Halong bay. more