I love on ramps..
For those in Niagara area, I love the 7th Street ramp onto the Toronto bound QEW, very nice. There are 2 ramps, one for northbound traffic, one for south, you need to be coming from the south, heading north.
Its a huge long curve, probobly about 300 degrees, and its got grass runoff all around it incase you chuck it.
Its rated at 40km, I usually do 90-95.