I lived in Rapid City and used to go every year.. Check out the Sturgis-Deadwood-Spearfish Canyon ride. "No Panties Wednesday" in Huellet Wyoming will take you past Devils Tower.
If you're getting your drink on, park and walk all around Sturgis. There's plenty of good live bands playing every day. And of course, there's the huge venues just outside town with big acts.
Whatever you do, don't get drunk, pass out...and drool Copenhagen all over your girlfriends sisters carpet. It's frowned upon.
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