The Radisson offers a free shuttle to the port for their guests and allows you to park free at their hotel while on the cruise. Quality suites is a "sister hotel" to the Radisson, and allows you to drive to the Radisson and take their shuttle. Be sure to make a shuttle reservation with your hotel reservation (that way they'll give you a time.)
Another "trick"....with a large family, have dad drive everyone to the port and dump the luggage with the porter. Mom takes the kids inside and gets in line to check in. Dad drives the car back to the hotel and hops on the shuttle with just his documents (no luggage, etc.) He will have no problem getting on a shuttle as a single person with no luggage. He can then meet mom in the line to check in. The only downside to this is that dad MUST remember to keep his documents with him, and must meet mom in line--all adults must be at the counter for check in.