Here's an interesting website where you can compare Alaska weather to your own:

http://216.246.11.178/~alaska/weather/alaska_weather_planner.php

I crunched some preliminary numbers, using a bottom-level H cabin, and the SF-Van 11 day is about $150 per day cheaper than the subsequent 8-day cruise Van-Seward.

Wendy
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Booked: Uniworld Egypt, 2015
Tauck Amsterdam to Budapest, 2016
Paul Gauguin, Societies & Tuamotus 2016