Floridagal:
If you use Cruise Connection (from McDonald's across US441 from Wal-mart), the convenience is hampered by not being able to leave your car for more than a few hours. Try to find an early-rising neighbor (you should be there not later than 6:15 am) who'll take you there, then come back days later to pick you up!
Or, find someone who'll come along later in the day and pick up your car, then bring it back mid-afternoon of your return day. That's what I do; my brother and nephew usually do this for me! It does work!
If you do drive to Fort Lauderdale (Port Everglades), there are parking garages there (one near Holland America's usual departure point, one near Princess'), but they're something like $15 per day now.
SWR