We were in Halong Bay for three days and two nights. It was absolutely spectacular and I wanted to post a few pictures while it was fresh in my head. The way the mist rises off the water and the thousands of islands seemingly float on the water is breath-taking. At one point, you couldn't distinguish the sea from the sky in distance, so a small fishing boat looked like it was flying. The whole scene is like something out of Avatar.
We were really lucky because the weather warmed up right as we left after having been cold for weeks. The good luck continues.