There is a city bus that does go to the Walmart store in Ketchikan. The bus does a complete loop of the city. There is also a crew bus that goes to the Walmart store in Ketchikan, but I think it is for crew only. As I recall the store was quite a ways from the cruise docks. The bus stops at the tunnel and the library, both stops are fairly close to the cruise docks.
Can't help you about Juneau as I have not yet visited that Walmart.
Hope this helps
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Received this replay about Ketcikan from the tourist bureau.
Thank you for your interest in Ketchikan. Walmart has their own van service which is free to cruise ship guests and crew. It is a white passenger van that says Walmart on it. They pick up across from the cruise ship dock near the Southeast Alaska Discovery Center. When you come to town, stop in at our visitor center which is located right on the cruise ship docks, and our visitor information clerks can assist you with directions to catch the Walmart shuttle. And of course they do provide transport back to the cruise ship dock area. Please let me know if I may be of further assistance.
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The BLUE bus does a Walmart stop. It picks up across the street from the Eagle Totem on the dock.
The Van, is very tough to get TO Walmart from the cruise dock. It is overloaded with ship crew, who don't think twice about stacking up extra people in seats. I have always had no trouble getting this van back to the ship, as the shoppers seem more spaced out.
In Juneau the Walmart Van was for crew only- last year. There is a city bus stop there. Bus pick up is on Franklin, down and across the street from the Red Dog at the bus shelter.