Koh Yao Noi

This is one of the largest inhabited islands in Phang Nga Bay but is still only 12km long and about 3km wide. It's about half way between Phuket and Krabi and has regular boat services from both - along with the daily boat from Tha Dan - when it is running.
While the beaches are not as white and sandy as the Andaman coast - most have some rocky stretches - it is slightly off the main tourist path and is therefore a lot quieter and more relaxed. There are probably 20-30 resorts here - ranging from £200 per night to £10 - a few restaurants and a couple of bars.

We spent half our time at Tabeak Viewpoint which is about 5 minutes from the beach on the side of a hill, with some wonderful views and a perfect spot to watch the Sunrise. The rest of the time we stayed at Sabai Corner - which is on the waterfront on the point dividing Hat   from Hat Pasai. Both have been very friendly and helpful and comfortable. They have both been full but with 8- 12 rooms each, they never feel busy.
Sabai has the slight advantage because it has a waterfront bar which opens at 5.00pm and serves excellent cocktails.