I finally got around to getting these maps uploaded.
The Saturday ride area is natural only. The location is Ashbrides Bay park, 5 mintes east of downtown Toronto along Lakeshore Blvd.
The Sunday ride area is mostly natural, but there is a huge amount of urban riding in the area as well. The location is J.C. Saddinton Park, 15 minutes west of downtown Toronto via. the Gardiner Expressway, Missisauga Road south (follow Mississauga Road all the way to the lake, will lead directly to the parking lot)
If anyone has any questions about Bash at Beach 2005, please post them here.