Hi Stephen,
Very soothing colors - and for the topic of the site, it fits!
A few things I'd tweak:
* The photo in the header is a bit to tall, ideally I'd like to see that no taller than the green area to the left; and it also stops short on the right and doesn't tile to fill the entire header area. So perhaps set that image to tile, or create a large image that will fill that space.
* Use a logo or at least a larger font, to make your biz name pop out a bit more. What you first see is the photo, not the biz name.
* The navigation on the left - with all the arrows & + 's I'm not sure where to click to go where I want. The font size is also a bit small for my eyes. I would remove either the +'s, and then make the arrows AND the words clickable links.