We are staying at Ron Jon's the night before our cruise as well. We are taking Tiffany Town car to and from MCO.
As far as getting to the port. I spoke w/ concierge at Ron Jon's regarding transportation. They told me that they do not offer a shuttle service but they have plenty of taxi service. We are a party of seven so the concierge said they would only need a call 5-10 minutes before we wanted to go and they would have a taxi van bring us to port. She stated that it would be approx. $15 and its a quick 5 minute ride!!!
Hope this helps!