I'm a big fan of the Black Hills. Very reasonable prices, and you won't find prettier country anywhere, IMO. Custer State Park is pretty much my favorite place on earth.
Getting there can be a problem, though. Flying is a pain in the ass since you have to hop a flight from a nearby hub city like Denver. Those regional flights can get expensive. I always drive (about 14 hours from Chicago), but obviously that won't work for 4 days, since you'll burn two travelling.
If you ever have more time, you really should check it out.
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