For car hire in Aberdeen, close to the ferry port, you have two options:
The closest would probably be Enterprise
The next would be National/Alamo
I don't have addresses for them, but they can be found at www.yell.com From the terminal, a taxi should be no more than 10 minutes and £5 to either location. It may be possible to walk they're probably about 20 - 30 minutes on foot, but they may be a bit tricky to get to.
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