I'd like some advice on accommodations. I'm driving through SD solo with 3 kids (preschool - elementary) on I-90. I'd like to stop and stay for several days in southwestern SD, and take the kids to see Rushmore, Crazy Horse, Badlands, etc.. I'd like to find accommodations that were fairly reasonable (well under $100), and were outdoorsy. I'll be camping most of the trip, but would love to find someplaces in the Badlands/RC area that had tent-cabins or no frills cabins (so I don't have to sleep on the ground or set up the tent for a night), that were also close to attractions. While I don't mind staying in commercial KOA-type campgrounds if that's all that's available, I really prefer more natural settings (with no PA systems and without RVs running all night long with radios and tvs going).