Here's the link to the 2007 Buffalo Garden Walk to be held, July 28-29, 2007. It's a self-guided tour of hundreds of gardens around Buffalo's West Side, including the West Village, Allentown, Elmwood Village, Erie Basin Marina, the Japanese Gardens, Richmond Avenue, etc -- way too many for any single person to visit even in 2 days -- and it's free!
I went on the Jamestown Garden Walk on July 7 which is only a few gardens, and enjoyed it immensely. I may come up for this one if the weather's nice.
Here's a link to the website which includes a pdf map of the sites.
Garden Walk 2007