There are few hotels near the beach of Ao Wai, but they are poorly presented in international booking systems. Find hotels in Ao Wai
How to get there 
Fly to Bangkok International Airport - Suvarnabhumi (BKK)
Taxi directly from the airport to Pattaya costs about 1500 bahts. Make sure to negotiate the price before the trip to avoid surprises. Journey will take from 1.5 to 3 hours depending on traffic.
There is also frequent bus service between the airport and Pattaya. It departure from Level 1 (Doors 7-8), costs about 150 baht per way and goes about 2 hours (or longer if traffic jams).
You need to get by bus or by taxi from Pattaya to Ban Phe
town, and next take a ferry to Ko Samet island.
The main transportation option in the island of Samet is by "songthaew" (some kind of shuttle mini bus). Find flights to Ao Wai
When to go 
If possible, try to avoid September, - it is the only real rainy month of the year.
Water temperature, C
Wind speed, meter/sec