Sorry I can't help with the cash machines but we used Boss's taxi firm which was really reliable. It cost 1000 baht from the airport to Khao lak . I just emailed him and got very quick responses every time. I would recommend the company. The email address is:
cheapest way would be using boss for private transfers and there is an atm set into the wall outside the onsite supermarket.
you can find e mail for boss and location of other atms in the faq section on the right hand side of the page
Thanks, guys, for such quick responses. You've both been very helpful.
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