I think I dated a plant like your wife, once.

Liked music and TV... watered every once in a while...
Just Kidding...
What about strip joints? She into those?! Plenty in Vegas.
Just Kidding.
When I travel with my wife, we often do massages. If you can find a "couples massage," you'd do well.
If she likes music - You might take her to Bally's... they have an outside deal, similar to "Cocktail." It is a great place to people watch.
If she likes the outdoors... I'm sure there is a place out there, where you can find something like dune buggies, or get out of the city, to do things.
Then, again... if your wife doesn't like to do all of those things... why would you want her to go to Vegas?!