holiday packing

I'm going to Croatia thursday, so I need to start packing. I hate packing my bags because I never know what to take with me. I never know what to do a few days before because I always think that I still need most of the thing. So I always do it at the last moment. Tomorrow I'm going to buy things I don't have yet. But I allready bought watershoes because of the stones in the sea. And two thing I don't take with me, but just wanted to have.