Port of Miami - Do I have to park in Royal Caribbean garage?

[alishac]

I was just checking parking rates for my June Icon of the Seas cruise, and was shocked at how expensive parking garage A (dedicated Royal Caribbean garage) is! For one week the rate is $245, while all other garages and lots are $145. I was considering parking in garage B instead. Has anyone else done this? How far is the walk from the next closest parking lot/garage to the Royal Caribbean terminal? Is it worth $100 to park closer? My husband and I are in our 40's, both in good health, and have no issues with physical activity, but it will be June and extremely hot outside, so we wouldn't want to do a 15-20 minute walk. Any insight is appreciated!