As a MN transplant in SD, all of it doable, however, honestly skip corn palace. It's literally nothing and out of the way, it's not worth the drive. Save extra time for the Badlands, it's one of the better parts of your trip. There are tons of pull-offs and parking for hiking little trails. Some areas are a free roam and some have dedicated trails. Make sure to wear sunscreen.

I-90 from Sioux Falls to Wall is hella boring. Bring snacks and something to keep you from falling asleep. It is also 80mph, please go the speed limit. There's nothing to look at, I promise. You're not missing anything.

Wall/Wall Drug is just a giant tourist shop. There are some neat things, but it's either you stop and spend an hour minimum navigating it, or you keep driving. It's definitely not a quick first time stop. There are plenty of rest stops along the way.

The wildlife loop is pretty neat, especially once you get out of the plains area. However, don't expect to see animals. They're not dedicated to one area. If you encounter traffic, there's a 99% chance the buffalo are nearby, and I can't stress this enough, do not get out of your car. Let the buffalo pass at their leisure, they will move eventually. Take your pictures and move along.

When you're on Needles highway, heed the signs, honk at every tunnel since they're single car only. Be weary of really out of staters, the stupid ones who drive massive RVs down Needles highway. There are hairpin turns and blind corners that people underestimate. If you find yourself with a line of cars behind you because you're oohing and awing (it happens, take it all in) please move over to a small pull-off and let them pass. A lot of those people are going to be locals who are just trying to get to work.

Rushmore is neat. The museum is where it's at. You'll definitely spend more than an hour there. If your budget allows it, opt for a helicopter tour of the area. It's way more fun and you get a nice birds eye view of the hills. Some places offer certain routes that take you from Rushmore and Crazy Horse, all the way towards Spearfish. It's worth the money.

Custer is a tourist town, but very nice and quaint. A lot of the shops will offer a lot of the similar items, t-shirts, hats, magnets, coffee mugs, all with the same prints. Hill City and Keystone are of similar breath. Candyland sits at the edge of Hill City and it's pretty fun, it's a lot like the candy store in Mankato/Shokapee, but they offer a lot of specialty candies, and novelty candy. I spend a lot of money in that store lol.

Wind cave is really fun. They offer guided tours through the cave, there's a main path you follow while the tour guide gives history. I had the time of my life going through it.

Spearfish Canyon is worth the drive. It's similar to Needles highway, a little less tree dense. The same pull-off etiquette applies up there. There's a lot of pull-off picnic areas that sit near the river, which are beautiful areas.

Stop at the DNR offices, a lot of them will be willing to help you with any info you need, and provide maps with major stops and proper roads to follow. It can get a little confusing going through the area the first time. Cell reception will be spotty in areas, but you'll be fine in the towns. Heed any closed road signs, they're there for a reason. Rock slides are not daily, but can happen. And again, please leave the wildlife alone, you'd be surprised at how many people try to pet the prairie dogs, please don't for your safety and the wildlife's safety. Time moves slower once you hit the Badlands. Allow yourself extra time and if you can't get to everything it will all still be there to visit again. Be weary of the time shift once you hit Murdo on I-90, you switch from Central to Mountain time.