Either one will run about $70-80 r/t. You can take the Lynx bus from the TTC to SW. Cost is about $2 pp each way. You tell the driver you want to go to SW. You will be dropped right at the entrance to the parking lot. Just cross the lot and there you are. To return, cross the lot, then cross the street and look for the bus stop sign. Easy. I think it's the #50 or 51 bus.
You can book the Mears shuttle from your resort to US/IoA. Do it the day before you want to go. Cost is $20 pp, r/t.