Kumgang-up Travel Guide

fantastic, though tourist-overridden mountain resort in 'north korea,' actually land rented by the hyundai corporation. if you go, you should have no trouble climbing the rugged moutain, because metal poles and stairs have been incessantly installed everywhere, so everyone can do it and enjoy the views of the east sea from the summit. try to practice your korean before you go, you might actually be able to speak to a north korean on the trail. they're the ones wearing the red lapel pins.

I went with Adventure Korea and they were great!
www.adventurekorea.com

We had an English speaking guide who was very personable and took us up the mountain to a spectacular view.

Interestingly, we were one of the few groups who stayed in a hotel staffed by North Koreans.. so it was a rare chance to interact with locals without the heavies watching every syllable.