Very nice tours but the only problem I had was trying to figure out how to navigate the site to get to the tours. As a VT person I knew I had to look around for them but I think a lay person would never find them and just give up. There is no real indication that a VT is even present. I just assumed it had to have some if you posted it here.
There is to much great information there to let it go to waste. IMHO I would make it very easy for people to navigate to the VT's.
Please be assured that my comments are all positive and your site is to good to not be fully utilizied.