There is a bus system which may work for you, but it depends upon how much sightseeing you wish to do.

Car Rentals
Airport on-site:

Alamo 1-800-327-9633
(907) 451-0457

Budget 1-800-527-0700
www.budgetalaskaonline.com (907) 474-0855

Dollar 1-800-800-4000
www.dollar.com (907) 451-4360

Hertz 1-800-654-3131
www.hertz.com (907) 452-4444

Payless 1-800-PAYLESS
www.PaylessCarRental.com (907) 479-0177

Off site:
Arctic Rent-A-Car 479-8044
www.arcticarsales.com

Aurora Rentals (907) 459-7033

National 1-800-CAR-RENT
(907) 451-7368

RentAWreck
www.rentawreckalaska.com (907) 452-1606

U-Save 1-800-272-8728
www.usave.com (907) 479-7060