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Thailand is a service driven country - there will be taxis galore waiting to take you. Suggest that you check on cruise critic for [a] hints of how to do this and [b]also join your roll call on cruise critic so you can chat with fellow travelers and perhaps share a private tour with them.
Waterhouse; I have actually just checked the Roll Calls and there are very active 'chats' goiing on for your cruise - so please do register as you will benefit greatly from the shared knowledge. On cruise critic click on boards.