Being that the Caribbean is the most common and largest number of cruises, it certainly is in error the above post that Alaska has "a much younger crowd". It clearly does not, with the bulk of passengers middle aged and above on all lines. But certainly all ages sail. For Alaska with so much outside the ship, I still recommend go for "Alaska" with preferences given to ports, time in ports, glacier, route, itinerary, price etc.
My opinion only, budget fully for costly excursions, you get only half a trip without them. I would never recommend foregoing them.
From Whittier, the Seward Highway is the EXACT same routing as the RR, so it is not recommended unless you take the regular run, the cruiseline contracted is too costly.
The above resturant reference in Talkeetna is the Latitude.