We are also doing the cruise and then some time at WDW...originally, we were going to use happy limo, but then someone else talked about cartier town car which is about $10 cheaper($150 roundtrip from airport to port canaveral) than happy...however, because we are coming down a day earlier we ended up renting a car for the day and then when we get back as we are staying at Doubletree and going to Universal and SeaWorld, we thought it would be easier (read less stressfull) than relying on busses for our WDW stay. When we priced it out, we were only saving a couple of dollars not using the town car.
If this is confusing, I'm sorry! But check them out anyway...
cartiertowncar.com
By the way, do you live near to where Bruce Springsteen grew up?