First road trip! Mpls to Seattle return Portland to Mpls
We are embarking on our first road trip with three older children who are very used to 5 hour+ trips each direction to our cabin and we're sure we could add a couple of hours per day to that if needed. We are leaving from Mpls heading to the west coast with 12 days. I'm thinking we could do 3-4 days each direction and have 4-5 days to split between the Seattle and Portland (1 day at the coast) areas before heading back to Mpls. I realize it is a very tight timeline but the goal is to get to the PNW area, the bonus would be to see a few highlights on the way there and back to give us an idea of future trips we'd like to plan. We will do Yellowstone as a separate trip next year or in the fall. I'm especially overwhelmed with how to plan for hotel stops ahead of time. I'd love suggestions for the one thing to see in each state on our drive through NDakota, Montana, Idaho on the way. I'm not sure what our return route should/could be so I'd love help with highlights we could see there. We are going into this with eyes wide open that we will be scratching the tip of the iceberg of travel but hope it opens the door to many more trips. We love hikes/parks/nature as opposed to tourist attractions.
The Drive Will Be the Trip
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I'm glad to see that you realize that you will be a lot of driving for the relatively small pay-off in the Pacific Northwest. In fact, you're probably looking at closer to four days each way and only four days on the coast, and even those middle four days will entail a fair bit of driving to cover the ground from Seattle to Portland. With that in mind, you should be looking to make the est use of your drive time and not just use it a means to get from Point A to Point B.
Basically, you are looking at I-94/I-90 out and I-84/US-12/I-90 back, although you could of course reverse the direction of your loop. Along the Interstates there are multiple opportunities for relatively short stops of an historic, scenic, or recreational sort and you should plan to make the maximum use of such smaller stops to break up each day's drive. As I said, I think you should devote four full days to the drives out and back and see some of the major attractions such as Theodore Roosevelt National Park in North Dakota and Mount Rushmore in South Dakota. Also keep in mind that both your routes will follow and/or crisscross the trail blazed by Lewis and Clark, so there will be ample 'teachable moments' on this trip, particularly at their western terminus Fort Clatsop outside Astoria OR.
As for where to stop each night, you should probably pre-book your accommodations since you may need a couple of rooms each night and certainly don't want to waste precious travel time looking for a place that meets your needs. Along the northern route three evenly spaced overnights would have you stopping in Bismark ND, Winnett MT, and St Regis MT. Along the southern route, look at Kooskia ID, Billings MT, and Presho SD. Note that your stops are spaced farther apart on the southern leg because it takes longer to drive between Portland and Minneapolis than it does between Seattle and Minneapolis.
Finally, while we can (and will) give you suggestions for what to see, the people you should really get input from are the "three older children". Get them some good paper maps of the states you'll be driving though - an atlas of the US would be perfect - and mark out the basic routes. Then let them find sites that they'd like to see along the way. Maybe even have them do a little research on them and act as tour guides for their favorites.
AZBuck