what do you want? beach? forests? snow? safari? cultures? depends what you both like.

its a very personal choice...

anyway congratulations

these are good hotel websites and you will get a better deal than the travel agencies here.

www.hoteltravel.com

www.precisionreservations.com

personally i do not like thailand very much....i don't dislike it just not all its cracked up to be

 koh phi phi vastly over rated but that is my opinion and loads rave about it......