My dad just turned 60 and wanted to celebrate with an old-fashioned family road trip to South Dakota. Thankfully, we had two cars on this adventure instead of back in the day when we squished everyone into the Dodge Caravan mini-van. We did all the touristy stuff (including eating lots of biscuits and gravy), spotted quite a few Harleys, Corvettes and R.V.'s, and generally had a good time in the blistering heat.
[Just to clarify and not piss off the geography buffs in my readership....Devil's Tower is not in South Dakota, but is extremely close and located in the upper NE corner of Wyoming.] Oh yeah, one last thing...if you're ever in Deadwood and desperate for a birthday gift for your father, don't hesitate to walk up to a cowboy and offer him good money for his belt buckle. It really is a win-win.