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Getting to Koh Yao
Long-tail boat ferries make daily trips to Yao Noi from Bang Rong Pier on the east coast of Phuket. From the airport, a taxi will take you to the pier in 25 minutes. To get to the pier, take route 4027 east from the Heroines' Monument, then turn right at the sign for Bang Rong (or Bangrong) and follow along for a few kilometers.
The fare is 50 Baht for the one-hour journey, with daily departures from Phuket at 9.30 am, 12 noon and 5 pm. The boat will make a short stop on Koh Yao Yai, then cross to Koh Yao Noi, only 8 minutes away. Long-tail boats can also be hired at Ao Po pier for charter to Koh Yao.
Также инфа есть тут:
http://wikitravel.org/en/Ko_YaoТут расценки и расписание:
http://www.kohyaochukit.com/location.html