If you have a car it's doable. In the mornings there will heavy traffic. To be at the front gate of the MK for 8:00 AM you will need to be parked by at least 7:00 AM in order to get the tram to the TTC, then either the monorail or ferry boat to the MK bag check area. Depending on the crowds it can take a long time for this transit. It will probably take about an hour to get back to your hotel from the front gate of the MK because you have the reverse transit. In the afternoon you can plan on slightly shorter travel times because it shouldn't be as crowded. So figure approximately two hours travel time out and back. For the other parks it is not quite as bad because of the proximity of the parking lots to the parks. Not close, but no secondary mode of transportation. Just a tram to bring you to the gate area. If the headache of traffic, travel, and parking is not a problem then it is doable.