krabi is a fantastic place, stayed on ton sai beach just round the corner from Ao Nang.the resorts on riley beach were the best ones.
depends on what you want from the holiday can be pretty boring round that area. I went with a couple of mates & did a lot of rock climbing & some scuba. the people out there are so friendly its unreal, so chilled out & laid back.
if you aren't into rock climbing or just sitting around getting a tan you'd be better off with koh samui though imo