Take 1 S and take airport exit. Once you begin to loop around the you stay in left lane to car rental return. You will enter garage and take the kevel that goes to enterprise return. Easy peasy.
Yea, there should be instructions in the documents handed back to you, but you will basically drop it off at the same location you picked it up at and there will be signs to direct you. Read your confirmation email or give them a call if you aren't certain!!
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