My mom and I took an Uber XL from the Renaissance Orlando Airport Hotel to Port Canaveral on September 28th. We booked it the night before, it cost us around 72 dollars in base fair, about 90 after tips and fees. Definitely make sure when you book that you're booking a level of vehicle that can accommodate the people and your bags. I expect you will probably pay quite a bit more than that, but you can definitely play with the app in advance to get a ballpark estimate. Honestly though, in your situation you may be better off booking some other private transit, or using the Disney transport. The risk with Uber is that nothing is guaranteed. Our original driver dropped our booked in advance ride when he was 3 minutes away. Luckily another driver grabbed it and there wasn't a significant delay, but what if there had not been a driver with an adequate vehicle around? With that many people and bags it is a huge risk. Yes Disney transport is 45 dollars per person but it's well worth the lack of headache and the certainty of knowing you and your bags will get there. We opted in to the Disney bus on the way back and were glad we did.