You're right... this will be the trip of a lifetime! My suggestion for breaking up your trip from Glacier to Yellowstone would be at either Great Falls or Helena. Both are good sized cities with decent motels. In Helena you can see the State Capitol, if that's of interest to you. I do think you'll have enough time to see all you want to see, particularly with a 9 and 10 year old along. In Glacier I would suggest taking the hike at Logan Pass on GTS Road up to the overview of Hidden Lakes. It begins on a boardwalk, is well-marked, and you will have a VERY good chance of seeing mountain goats which are almost tame and come within a few feet of you, as well as an abundance of wildflowers. At Many Glacier there is a flat walk around Swiftcurrent Lake (but don't do it at breakfast time... we came within 50 feet of a bear on the well-traveled path!) On one of your Many Glacier days, you might want to take the side trip down to the Two Medicine area. I haven't personally stayed at the Prince of Wales lodge but have driven past it, and there is some amazing scenery out the back door. In Grand Teton, take the boat across Jenny Lake and hike up to the falls and Inspiration Point. Also be sure to take a float trip down the Snake River. You'll probably see bald eages and the kids will have a great time. Take the kids to Jackson Hole to see the town square with all the antlers. You might want to consider staying somewhere like the Buckrail Lodge, which is only 6 blocks from town and has family cabin-like rooms. It is not as expensive as much of the accommodations in the area. Two other possibilities would be Jackson Lake Lodge (with incredible views) or Colter Bay, if you want to spend a little less. Have a great time!
