I'm going to Alaska July 6th and coming back on July 13th. You can actually rent a car from Thrifty Car rental. I'm paying $22.99 + tax=$ 26.00 for Med size car. They will pick up from pier 30 and take you to Pier 48 to pick up rental. You can also drop off car at airport, no addtional charge. So you might look into a rental to get around better in the city besides down town. With the money your spending on shuttle to get back to airport, it is cheaper to rent a car.
Star Princess, Can't wait