I am trying to plan my first trip to Asia in November and I can't seem to make up my mind on where to go. I will be travelling solo. I basically have 18 nights to spend and I will fly into Bangkok and fly out from Hong Kong (cheapest flight I could find). I will be using Air Asia between cities as it's pretty cheap and convenient. I would prefer not to move around too much. I want to spend at least 3-4 nights in each city I visit. Right now, I'm leaning towards doing:

4 nights in Bangkok
7 or 8 nights in Phuket for some R&R but I'll also take a day trip to Ko Phi Phi, though I'm scared to death of the boat ride there (I get seasick very easily)
3 nights in Kuala Lumpur (not sure about this one)
4 nights in Hong Kong

Any suggestions?

Thanks!