Thanks for the replies, and that web site is indeed great.

I just had a few other questions; one is whether is it possible booking accommodations and travel on the spot, or do I have to pre-book everything. For example, will I able to book a flight to Bangkok from Chiang Mai when i arrive at CM? Will it be simple enough to get a room once I arrive on an island?

And another thing I would like to know is whether it makes sense to go to both the southeast and southwest of Thailand? I want to visit both Samui and Phuket/Krabi but I don't know if its sensible to go to both on a one month trip? If i do go, will i have enough time to see the major things of those places?

Again thanks for the replies.