Best way to go to Vero after cruise...

[princesses2]

I'm planning to cruise then go to Vero for four nights before flying home. So what's the best way to go from MCO airport to port then to Vero then back to airport. Since there are 9 of us, Disney transfer is expensive. Plus, I don't know if it will take me to Vero from the port. I have thought about renting car one way, drop if off before the cruise, rent another car after the cruise and drive to Vero. But then I'd have to deal with renting 5 carseats at $8/ea/day. Last time, I looked into renting a car for one day, it cost me more to rent 3 carseats than the car. And I'm not going to bring my own this time. Such a hassle last time.

I've heard of Town Car/Limo/SuperShuttle and wonder if anyone of those would be a good option for me. But then if I need a car to get around at Vero Beach, I may have no choice but to rent. Any thoughts?