Just chiming in on the speculation.
There is a website claiming that maternal DNA markers found in polynesian ancestry are also found in the Haida Gwaii first nations people. Some oral traditions and stylized knives and headwear are also somewhat linked to hawaii.
However, there is also clovis evidence in a cave called Gaadu on the Haida Gwaii which was dated to around 13,000 bc that had the remains of grizzly bears and clovis points. There are no grizzlies on the haida gwaii currently.
There are a few crackpot theories of Icelandic "norse" settlement on the west coast, with several folks going to the extremes (fake runes carved into rocks, planted evidence) to try and make it into the history books.
The reason the norse "vikings" left north america(baffin island, nfld) was because of a cooling climate. It can be interpreted that the temperatures where much warmer in the northern hemisphere 5,000 -1500 years ago.
As for the west coast.... the Haida Gwaii routinely paddled to Vancouver for raids. It's a long journey, pretty much Alaska to Washington.
Also surfing season is in the winter here. We get high pressure that locks in and keeps the ocean flat for months. That is why we can catch so much tasty halibut. (Good jigging weather)
My .00 cents (we got rid of the penny and round down now)
(Edited some dates and names)