Have you thought of koh lanta you can travel by road from Phuket and the scenery is worth looking at. Only went for the day last christmas but loved it a lot quieter than phuket that we went to after and not keen on now.
The journey by road took 2.5 to 3 hours cant remeber the price now but about 35 quid. You could change your flight to Krabi. Who you flying with we were with Thai and it was easy to do this when we were there.

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Kiss
God laughs at people who make plans.