Where to go next?

Okay, having said goodbye to all my travelbuddies from 2007 it is now time to decide where to go next. Weather used to look good for up north in Chiang Mai, but it turned from "really sunny" to "partly cloudy with rain/thunderstorms" in the past few days. I also checked down south, and most of it seems to be rain all the way - only Krabi/Phi Phi has a really great forecast going for it.... Or should I skip Thailand and simply go to Vietnam, which I missed out on during the last trip? Tough decision! But as always, the old Denis Leary line i like to quote for backpacking is true yet again: "Don't make any fucking plans!"