I'm not sure why this is an issue. If you park at the TTC, where you're supposed to park for park access, you can go to MK for the day, head to the Polynesian for dinner, and then just walk over to the TTC and leave. The walk is about 10 mins.
It is not intended that you park at the Polynesian early in the day, then head to MK and return to the Poly for dinner.