We enjoyed routing through Devil's Tower and then through Wyoming into Yellowstone. Gorgeous country out there.

- Cherie

"Best" is very subjective. Most scenic, most things to do, fastest, least mountain driving, which of these are most important, which next in importance, etc?

Our number 1 concern is the mountain driving, the easiest safest route. Number 2 would be things to see. I don't think we will have as much time to stop and tour as we will have a schedule to get to the destination (I hate that but sometimes it is unavoidable - this time it is family obligations). I should have mentioned that, thanks for the reminder to be more specific. :)

The easiest route for mountains is I-90 since even though there are passes you have multiple lanes and can stay over to the right and go slow. All routes have multiple mountain passes. Once you get into Washington you can take US395 south to I-84 to avoid the passes in Washington. You can hit Devil's Tower on this route, but not Yellowstone or Glacier unless you make side trips. There are places to see in Montana (lots actually), Idaho (Wallace and Couer d'Alene) and Washington (see sights in Eastern WA, you can see Western from your base of Sequim). To get to Sequim your GPS or routing program might route you via ferry across Puget Sound in Washington, but I recommend taking SR16 from Tacoma or US101 north from Olympia.

That is a great help. We will so as much site seeing as the time will allow. I'm still working on when we'll get to the SD area. We have a son getting married in Iowa July 28th but hen we want to hit the road and see the Badlands and Mt. Rushmore. Will make some reservations at Custer State Park as soon as I zone in on a time schedule. I hate having time schedules but the family doesn't cooperate (lol).

The only easy direct route from Rapid City, SD to Sequim, WA is I-90. The Interstate highway system is setup to avoid any steep grades but the grades may be long. No worries, however, as that's why your coach has lower gears! There a a ton of things to see between these 2 locations so you will need to balance ease with desire. If you just need to get from point A to point B you will be in Sequim in under 1300 miles. If you want to visit some of the spectacular sights along the way you are going to have to make some adjustments to your travel schedule.