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I would think you have left it a bit late to cruise in March - most will already be sold. But suggest that you look at RCI Rhapsody of the Seas out of HK - she is doing some great little cruises and you can end with a few days in HK. Happy Anniversary.
Why not try princess cruises they are in the far east at that time and are a fantastic cruise line especially for celebrating something like youe 50th anniversary.