So just to make sure I understand the limits of your trip:
- You have a week to circulate prior to beginning the "cruise" southward;
- As a given condition, you will not be driving your RV to/from Alaska;
With that in mind, some further thoughts from this near lifetime Alaskan;
- I still suggest getting a Jeep or Pickup for your week of visiting and using motels or B&B's for lodging; a lot less hassle to hop in a truck and drive away than breaking down an RV if you're limited for time and the Jeep WILL give you access to places you can't go with an RV, particularly a rented RV.
- With a Jeep/Pickup, one can travel the Denali Highway. IMNSO, the most scenic drive in AK.
- You might have time in you non-cruise week to squeeze in a flightseeing or riverboat-seeing trip....take this chance if you can. Lots of options in Squarebanks and Los Anchorage both....possibly slightly more in Los Anchorage.
- The train trip from Squarebanks to Los Anchorage is just that, a train trip; you'll see much of the same scenery (at a much more variable pace) to just drive the highway.
- I'm confused if the water-borne part of your return trip is a commercial cruise line or the Alaska Marine Highway System ("AMHS" "Ferry"); While I've never taken a commercial cruise line, I've spent a fair amount of time in SE Alaska and seen them come and go; most cruise ships tend to pull in to town (Ketchikan, Sitka, Juneau, etc) disgorge passengers to the tourist traps selling made-in-China trinkets and then, 6 hours later, reload and sail away.....with many/most of the sailing legs taking place at night. IF TIME PERMITS, as previously suggested, try to schedule your return on the AMHS from Whittier to Bellingham with a few days at the major stops (Juneau, Ketchikan, etc). Much more relaxing and more opportunity to see the country. FWIW, IMNSHO, if you can't take the time to stop a bit on the way down, a commercial cruise might be better: The AMHS routing from Bellingham to Whittier doesn't allow much time onshore unless you break it into separate legs;
- As pointed out above, a first trip to AK is often an appetizer: the next trip can either be the longer RV trip or (as several of my Texas colleagues have done) a fly-up & back hotel trip interspersed with multiple day trips for various off-the-road-system activities.
CRL
My RV is a 1946 PA-12
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