For our trip, we took ME to the resort, then rented a car from
Alamo for two days. We got it for $23 a day. They (Alamo) picked us up at MGM, took us to the car care center, we picked up the car, and drove back to the park. Went to NASA the next day. Then we took it back to the car care center at 7:30am and got a ride to EPCOT. It worked so well.
By the way, we went to NASA on Sunday. We did not have to fight any rush hour traffic coming or going. It was wonderful! NASA was a blast and we are so glad we did it.