We loved the excucar service offered by super shuttle. When we got off the magic repo cruise a couple weeks back..the driver had waited almost an hour for us. He could see all the confusion.
A few days later we had also reserved their services to take us to the airport from the GC hotel. We had a 4am pick up time, the driver was already out front when we exited the resort bright and early that morning. This time, they had brought a limo for us. We loved it and what a way to end our vacation.
They are very prompt and professional, you reserve and pay for them in advance, including tip. We gave them a bit extra of course because we had extremely heavy bags and a lot of them.
You can get the phone numbers at supershuttle.com (they also offer a van service) We have used the van service offered by super shuttle in both Florida and Texas and it has always been excellent. We prefer to have the private car service though.