copy and paste this on Google maps for directions.
Roger's Avenue Long Point Beach R.R.#3 Port Rowan,ON N0E 1M0
And on your last post they said Rays at the marina has minnows. Call to make sure. If not since you are in London there is a plaza on Highbury and Huron on the north west corner of the intersection (has play it again sports store there) has a place with minnows. Not sure of the name