It's great to see some activity on this site again!
As far as the Alaska sign, I think this was probably based on one or more signs in Maine. There are signs like this all over the state (and in other states?), the most famous being this one:
MAINE'S FAMOUS SIGNPOST | Flickr - Photo Sharing!
pointing to many of the place names in Maine that are in other countries; Peru, Mexico, Paris, Sweden, etc. (unfortunately, there is no Nepal, Maine) There are other local signs posted at people's camps (summer cottages) pointing in all directions, are multicolored, and resemble the Fandango signs.
This one is also in Maine (scroll down the page to get to the picture): â€śNorth to Alaska, North to—–â€ť No Wait its Maine | On the Road Again
I remember in the interview I heard with Pel Stockwell he said everything you need to solve the master riddle is in the book, that he and his brother were not internet people, and that the only thing that might help you is to know a little island history. I'm trying to keep that in mind as I work on the book.