How do I get back to MCO to rent a car? I thought that I could take the ME bus, but I can't figure out a way to book it without having an airline reservation. Thanks!
Agreed. You can book, let them know you don't have a flight but you'd like to be at the airport around 'x' time.
BTW, you do know there is the Car Care Center on Disney property, along with Alamo(?) at the Swan/Dolphin, I believe Hertz(?) at Shades of Green, and others just immediately off property. You don't need to go all the way back to MCO to get a rental.
The Car Care Center is near the Magic Kingdom main gate/park exit. Alamo/National provide a shuttle service that will pick you up from all WDW resorts to the CCC to pick up a rental car. You can reserve the shuttle by calling them directly.