Good Luck CJ!!
Yes there are a couple of very nice indoor offroad tracks in Vegas.
I checked out Las Vegas RC Raceway last year, nice track with some of the nicest clay you will ever see. The owner told me he spent 50k just on the clay alone and had it hauled in from Pennsylvania.
The other track is 702 Raceway. Didn't check that track out but it looks like the have the same white clay as Las Vegas RC Raceway.
Have fun, Vegas is a blast!!!