If you want Italian food, head to Gina's Bistro. It's on Durango and Flamingo (20-30 minutes off the strip I'd say).
Also in Summerlin there's http://www.marchebacchus.com
which is excellent, has great wine and is next to one of our many man-made "lakes."
Rosemary's is also good as others have said.
There's also Roma Deli; although it's a deli, it has seating and they make some great stuff. Spring Mountain and Jones.
If you want any Chinese, Vietnamese or Korean we have a "Chinatown" on Spring Mountain which almost reaches the strip. I think it ends just after Valley View.
Good burgers can be found at Otto's which is across the street from UNLV (and we have In-n-Out).
Indian food is available at Ghandi's on Paradise and Flamingo (best in town - but it's not amazing).
As for the strip . . . what a horrible place. Enjoy your stay and thanks for the tax dollars.