Eat at the Alpine Inn in Hill City. You get your choice of either Fillet Mignon or...... Fillet Mignon. And it will set you back about $10.
Also, at least drive past Crazy Horse. One of the greatest man-made accomplishments in the world. No, it's not done. Rome wasn't built in a day, as they say.
As for the birds, I couldn't tell ya. When I'm in the hills I'm on a bike checking out the flashing women at the Rally.
Edit: Oh wait - forgot to say if you get to Rapid, eat at Sanfords. They give you a toasted hoagie bun and honey butter with most of the dinners. It's
amazing.