I highly recommend Many Glacier for the east side of GNP. My wife and I spend almost every weekend of the summer there. Also while you are in Yellowstone you need to drive the Beartooth highway!
Awesome trip! Great read, on your trip to Alberta you should check out the plane crash near Coleman off the Crows nest highway. A friend from Calgary told me its a must and on my bucket list. I don't think my stock 5th gen 4runner would make it tho. Good luck on future adventures!
Sorry you have crappy weather today. Going to the Sun Road is an awesome drive! I hope you enjoyed it. If you didn't and you go back up, walk a few hundred yards down the High line Trail, it is epic! Tomorrow is supposed to be nice.....
Don't worry too much about the bear attack. The last fatal attack was 20 years ago. You will be fine floating the North Fork. Enjoy the scenery, laugh, have a good time. Let the bears know you are there. Don't cancel your float because of this attack, you will regret it.