Thailand has two coasts and two rainy seasons. If it's dry in Phuket it's raining in Koh Samui and vice versa. If you choose the right resort hotel/location you won't get masses of tourists or the bar girl scene. I really like Thailand (going myself in three weeks) because it's so darn inexpensive. I plan to feast and sleep for next to nothing! My hotels in Bangkok and Siem Reap are about $40/night. I have stayed in the 5-star places (Peninsula, Shangri-la) but I know these little boutique places and they are just fine for my girlfriend from the US and myself. It's a chicks' holiday! And there are the cutest and tastiest Thai restaurants available that I swear have better food than the big hotels.
Mandi