Another vote here for St. Mary's KOA on the east side. If you stay over there, visit Two Sisters Cafe and get some pie. They're amazing.
Bring your passports with you. You're soooo close to the Canadian border, it's worth driving up there to dip your toe into Canada, just to say you did.
"Canada is like America's attic. We hardly ever go up there, but we're always surprised how much cool stuff is up there." (Kathleen Madigan)
I would look at the route north through Utah instead of Wyoming. The 15 through Utah is so much faster. They say there are two seasons in WY: Winter and highway repair. You can get caught in some crazy delays up there. We took a little detour one time when we were driving from Laramie to Casper. It was a nice dirt road, pretty scenery, well maintained, with a nice man wearing dockers and a wind breaker who waved at us as we turned off the highway. There was another nice woman in slacks with a sidearm at the other end of the road. It turned out we had detoured through Dick Cheney's ranch. Nice spread. Huge mailbox that said Cheney...comically huge, like Bugs Bunny's.
Wyoming is gorgeous, except for the parts that aren't. The drives are deceptively long though. I don't think I'd drive through WY if I were trying to make good time.
Laramie is interesting, but not enough to make it a destination. My kids went to the University there. It's a great school, but not the best college town.
We did the trip to Glacier from our home in So Cal a few years back. On our first day out, I set my record distance for towing. We made it from the L.A. area clear to Pocatello, ID. 850 miles in one day. Never again. The next day was under 500 miles, but just as many hours because the roads were slower.
Glacier is totally worth it, but the trip isn't for the weak.
Our family went white water rafting there for the first time. One of our daughters loved it so much that she went to work as a rafting guide.
(By the way, my wife and I broke that one-day distance record winter before last when we were driving down from Post Falls, Idaho. We were in her Dodge charger and the roads south through the panhandle were too snowy for her car. So we went east into Montana to drop back down the 15. It was snowy though, so we didn't get very far that first day. The next day we made it all the way home from Dillon, MT, to L.A. 1040 miles. I told my wife we had to either make it all the way home that Saturday, or she had to buy me a room in Vegas that night so we could watch the Superbowl the next day. Either way, I was going to see the game.)