Sea kayaking at Halong Bay is so different from all the canoe & kayak session that I ever did. It is especially exciting (& challenging) when you are teaming up with someone who is not so well in kayaking.
It is such a wonderful experience to paddle between so many strange formations of islets.
Yes, sun bathing as a major sport during your Ha Long cruise. That reminds me of my sun burn for not applying sun bloke during my Ha Long trip.