Brad,
I have been to PEI a few times and you will not go wrong with Crowbush or Dundarave, which are the only 2 on that list I have played. Dundarave is part of the Brudenel River resort. My recollection of the latter is that it is really spead out, huge greens, very interesting. Crowbush is the jewel of the island, though and well worth it. Works it way into the dunes and links on the north side of the island, some of which are spectacular. In a town nearby called New Rustico (or was it North Rustico) there is a federal park filled with gorgeous dunes. It would be dreamland for any architect but it is parkland forever.
Green Gables looked interesting. I was not able to get on for some reason but also was a bit mistified why a Thompson design was not more prominent.
You mentioned a Les Furber course. He is a very good architect based in Canmore, Alberta and has done a lot of work in the west. Predator Ridge and many others.
Finally, if you have never been to PEI it is worth spending time there. The people are so down to earth you think you have gone back in time. Driving around the island it looks perfect. Every building freshly painted, beautiful fields of red earth, no piles of rubbish or old cars, just old fashioned farm country. It is a deal financially as well.
Have fun.
Bob Jenkins