For all of you who like gardens or architecture, the 2009 Buffalo Garden Walk is July 25 and 26. This is one of the largest garden tours in the US, featuring 300+ gardens on Buffalo's West Side from the Erie Basin Marina to Forest Avenue and from Main Street to the Niagara River -- all absolutely free.
For out-of-towners, you can also take in the Darwin Martin House (Frank Lloyd Wright) and/or the Olmstead Park system as well as include a side-trip to Niagara Falls to see the Falls and do the casinos (bring your passport or enhanced id driver's license to cross the border).
Here's the link: Garden Walk 2009
If the weather's half way decent, I'm thinking I'll do both days this year. It's well worth it! Last year they had a "jitney" bus to take walkers around the garden route. We drove ourselves, picking parking spots near neighborhoods with lots of gardens within walking distance.
Here's a link to my pix from last year: Garden Walk 2008