I can't recomend Tongsai Bay Resort (http://thaipro.com/cgi-bin/jump.pl?url=http://asiatours.net/thailand/hotels/usm_tongsai_bay.html)in Ko Samui enough. My girlfriend and I stayed there 2 years ago and loved everything. The rooms are amazing, all with decks, indoor AND outdoor bathtubs and showers (larger suites even feature outdoor beds), the food was great, the service was great, the location is perfect -- 5 minute cab ride from Chaweng. And it all seemed like such a good deal .We paid like $200/night and they upgraded us to a suite the last two nights. We thought it was perfect.
Email me privately if you have more specific questions:
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Kevin