There are many things to do on Cat Ba especially if you love water. The Halong bay tour is definitely worth your attention as it will include a good overview of Cat Ba and some great sightseeing of the small islands that populates the Bay. The tour I got into included kayaking and swimming, a trip to Monkey island and a beautiful sunset at the bay. Cat Ba Island is a nice escape since it's quiet.
Steve
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Co-founder and CMO of FAQtr - the blog that gets you.