We've been planning to do a Vietnam cruise or land trip for a long time. My criteria for a cruise has been time of year and itinerary - preferably the maximum days in Vietnam, with no ship overnights in Hong King, Singapore or Bangkok since we have been to all three cities before. A pre or post in Hong Kong, Singapore and/or Bangkok is fine, but I'd rather just be in a hotel and more easily explore places we haven't been. Plus there are fabulous hotels in all three places.
I looked into booking the Radisson Hong Kong - Singapore while we were onboard in the Baltics, but they stay overnight in all three cities cutting down the length of time devoted to ports in Vietnam. IMHO the best time to go is December-February. The Silverseas savings is wonderful combined with our ideal itinerary. You can book a silver suite for close to what a regular suite would cost on Radisson's world cruise or on Seabourn. I'm sure we will stay in Bangkok or elsewhere in Thailand at the end of the cruise for 3 or 4 days. Holding a silver suite - 723.
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Leslie