Update after a couple of more hours research on Ko Chang:
After
checking some weather and some more travel sites I found out that Ko
Chang is one of the wettest parts of Thailand during rain season. Pretty
tough rain (over 1000mm!!!) with heavy sea, thunderstorms and lots of mosquitos. Boats
and some resorts are not in operation during that time, especially on the islands of the archipelago. Most of the
travel and weather sites recommend Ko Samet in summer. Oh well, so back to the
beginning, maybe start off in Ko Samet and see how the weather is, have
to keep checking it and find out some more on transfer options from Bangkok Suvarnabhumi Airport to Ko Samet leaving out Pattaya...
