South Dakota suggestions for things to see.

The Jolly Green Giant and the Spam museum. A Spamberger across the street from the museum. Edit: sorry, wrong state!

You should visit the museum on the campus of the School of Mines in Rapid City if you have any interest in dinosaurs and geologic minerals and other things along that line. They have world class specimens and full size fossils of these creatures; cost is minimal if I remember correctly. Custer State Park is a must along with Mt. Rushmore and the Needles Highway as several others have pointed out. Wind Cave NP and the bison herds are worth your time too.

You'll love the drive thru Custer State Park. Those wild burros have quite a scam going. One stands in the middle of the road to stop traffic while the rest go from car to car begging for carrots. And hold onto the green part. Their eyesight isn't that good. :)
I suggest going early morning or late afternoon. In the heat of the day, the animals hide in the trees well off the road. Finally, Custer is a state park so the national parks pass doesn't get you a discount.

On the way, drive thru the Badlands. The road leaves I-90 and returns near Wall, SD. I've often wondered what the first settlers thought when they encountered the Badlands. Probably thought that they had found the end of the earth. Its stark, but beautiful.
Stop in at Wall Drugs in Wall, SD. for free ice water. That's all that's free, but its fun to see.

Badlands National Park has not been mentioned; fairly close to Custer SP.

dbbls wrote:
Custer State Park is a amazing place. There are also many pretty drives to make in the area. Needles highway for one.

We worked in Custer State Park and had a great time. There are a lot of things to see and do.

If you want to see the buffalo in the park, go either early morning or late afternoon. During the day, they are pretty much hidden in the brush taking a "break"

Take some pop corn or carrots for the burros.

Don't leave out the Crazy Horse monument.

The Reptile Garden has a really good show.

Take in one of the dinner shows, good entertainment

Do a Google search for `south dakota tourism' and read on and/or do the same search in this forum.

Thanks everybody for the suggestions. We will have about a week to adventure and are looking for great places to stay as well. Thanks for all the help.

If you've only got a weekend then yes, Black Hills area - Custer State Park, Jewel Cave, Wind Cave, Mt. Rushmore, Crazy Horse, Needles Highway. More than enough for a weekend. Enjoy & safe travels.

Needles highway and the Peter Norbeck scenic byway are both well worth the time. Take a picnic lunch and stop along the way.
We enjoyed exploring the town of Lead which is a stone's throw from Deadwood and has an operating gold mine with tours available.
We liked the dinosaur museum in Hill City...small, but free (donations accepted) with a great collection of T rex head and whole bodies.

Custer State Park is a amazing place. There are also many pretty drives to make in the area. Needles highway for one.