Putting the catigories right across the top might help. I have been to the site 5-6 times and didn't notice them until you mentioned them. Maybe a brief blurb at the top about the site and the author.... and you could put a few words of how to navigate in there? Feel free to throw a video of mine up there. This one is my favorite, but there are a few more that I put on Vimeo.
Let me know if you want more info about the trip before posting it.
https://vimeo.com/73835366