I was there last August and it was great. I would highly recommend you drive to fish the South Fork of the Flathead in the Bob Marshall Wilderness Area. It is a 2 hour drive down a windy dirt road that skirts the lake and you end up in the middle of nowhere. The South Fork is gorgeous and contains about the most genetically pure strain of west slope cutthroats remaining in the USA. The scenery is astounding. At the end of that dirt road, flowing into the South Fork, is the Spotted Bear River, which is much smaller but a ton of fun to fish. Not kidding, a wild, native cutt on every cast! Use a Royal Coachman dry fly, they love that fly. There are not a lot of large fish, but the fact that they are purebreds and wild make it a very special experience. There is a fly fishing lodge back there called Spotted Bear, would be worth a guided trip if you can swing that. Just look out for grizzlies. I posted some of my photos on this site, they might still be in the archive.