Thats ET Seton Park and I think those ponds are fed from or linked to a creek that connects with the main don river, so there's likely fish to be caught. If you are looking for another site in the nearby area that also has fish, try the Don Brickworks Park ponds....
Mike - have you fished the brickworks before? What kind of fish do you expect are in it? I know the don has a terrible rep for being dirty....
I am seriously considering taking my fishing gear to work tomorrow to fish this after 5. If I get the chance, I will report back in what (if anything) I see/catch.
My advice - go the island, more places to fish, plus its a nice photo op on the way back (downtown GTA) if all else fails.
I think the reason you are not getting any replies here, is cause all this information is on the forum. Read some of the posts, and get yourself up to speed.