I'm sorry but I really don't like this.
First of all - it's WAY too big. Everything is just... too big! The text, the logo and the images.
Secondly, the colour scheme is a little wrong. My advice when it comes to colors is to not use any colours in their strongest form - lighten them or darken them. So using green in the form of '#00FF00' is way too strong. It makes websites so much easier on the eye (of course there is an exception for black and white).
Thirdly, interactivity. You have included ':hover' in your code but you haven't actually given it a different value! Things like this can make or break a website.
However, on a good note, I love the fact that you've chosen to use <div> tags rather than tables.
Also, your coding is quite good - you've got a Doctype, and the code is fairly clean.
But all in all, you have a lot of improvements to make. Most of them are in the CSS arena so I think that is the area you should focus on.
I'm sorry if this comment seemed a little harsh in places but I really am just trying to help you out! 
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