I'm trying to plan the best way to get to / from Port Canaveral during our vacation this summer. Our itinerary is:

Saturday - arrive MCO, spend 5 nights at Polynesian Resort

Thursday - depart Polynesian, take 3-night Disney Cruise

Sunday - cruise returns, spend the day at Universal Studios, sleep at MCO Hyatt

Monday - early AM flight

There are 4 of us including 2 children in need of car seats. We like Magical Express, but I'm wondering if the Disney Cruise bus is the best way to get to / from Port Canaveral. Especially since we'd like to get off the ship and go to Universal Studios as early as possible. Can you get a one-way transfer on the bus? Is it easy to get a rental car at Port Canaveral?

Thanks in advance for any tips and advice.