XDJMs, My parents are visiting me right now in U.S.

XDJMs, My parents are visiting me right now in U.S., I would like to give them a Alaska cruise. Since both of them are old, I think this is the first time, also the last time for them to do the Alaska cruise. Thus I would like to maximize the tour route and leave them a beacutiful memory. I know in this forcum a lot of people have extentive experience about alsaka cruise, if you can share some experience with me, that would be really helpful. thanks in advance!

Question 1:
My parents are chinese citizens, they hold B2 visa (mulitple enter to U.S., so no problem to reenter U.S.) to visit me in U.S. Do they need candan visa to do the cruise since a cruise starts at vancour.? If they do, is it easy to get the visa? what is the procedure?

Question 2:
What is the best route? I would like them to see the galcier and most interesting spots in Alaska, what is the best route?

Question 3:
What is the rough cost for each person? is this a good choice for my parents comparing to carrieban cruise?

Thanks a million, bow:)