hello,
i was in chumpon last dec. and i must say the wind was great. 15 to 20 almost from 10 to 6. you actually go to thu wua len beach which is 20 minutes from chumpon.
from Bkk better to take the train and from the station, either a cab or songtaw to that beach for 1$.
i think this goes on until feb but of course can vary from season to season.
a little remote but enough restos. bungalows are cheap with ac and tv (thai only at my place ....) for about 15 $. motor bike are 5 $ a day and worth it to go to chumpon and around. there you have internet cafes, a few little shops and 2 kite schools selling cheaper equipment.
i must say this is the best place i have seen in thailand for the wind so far but of course, there could be no wind sometimes too. there are 2 spots. one with shore break and another flat one in a different bay. you can always start in chumpon early in the season and end up in hua hin later in march.
marc-a.

some shots : www.seabreeze.com.au/gallery/gallery.asp?imageid=9331

hello,
i am not sure when it really starts but referring to the 2 schools there, nov. and dec are the best month.
for the size, me beeing 73 kg, i would only take my 12 sle. but i guess 2 kites would be a safer bet anyway.
check those : www.kitethailand.com/
and www.kiteboardingasia.com/chumphon-kiteboarding-kitesurfing-asia-shop-school.php for more informations.
marc-a.