if it doesnt have to be in vegas, there is a ghost town and mine tour found
http://www.eldoradocanyonminetours.com/ .. nice folks that run it and good story tells too.
in vegas i can recommend the following things/shows:
Le Rêve <- kick ass ...
Blue Man Group <- simply amazing and funny..
KA <- second only to Le Rêve in kick assness..
educational shows:
The human body and the titanic collection.
thrills and chills:
also big shot on top of the stratosphere ;) that one will chill your bones and if you like coasters the one on NY NY is ok...
what not to see in vegas:
Zumanity <- blows imo