One day last week, I took a drive (on the back roads) about 45 minutes northwest of Mississauga to Rattlesnake Point -- part of the Niagara Escarpment -- just west of Milton. The photo below was take from the upper cliff trail at Pinnacle Point, looking roughly southwest, towards Lake Ontario.
This was my first visit to this conservation area park (admission $5 for the day, though you can get season's passes that include all 5 parks). From the gated entrance, where I picked up a trail guide, I followed the road to the furthest parking area, circling almost back to the entrance. A short walk through primeval woods took me to the amazing views from the top of the rock climbing area.
The stair access to the lower cliff face was blocked off this day as a film shoot was in progress. You can see some of their gear in the photo above.
The Niagara Escarpment is a series of parks with waterfalls (of which Niagara is the best known), woods and wildlife, cut through by the Bruce Trail. See, too, my photos of the waterfalls in the adjoining Conservation Hamilton area.
Update March 2008: More photos on my site for Rattlesnake Point.