Follow-up. Was thre today for powerhouse tour. It was short but useful. They do need to update their tour infrastructure - the movie shown at the start clearly was made some time in beginning of 80s, and displays/posters/etc were not long after that.

After the tour drove to Valley of Fire and had really good time exploring and hiking. Valley of Fire now is mine one of highly recommended state/local parks, like Dead Horse State park in UT.

Thanks everyone.