|There is a virtual at the Welcome to Las Vegas Sign|
A Virtual Cache is about discovering a location rather than a container. The requirements for logging a Virtual Cache vary—you may be required to answer a question about the location, take a picture, complete a task, etc. In any case, you must visit the coordinates before you can post your log. - Geocaching.com
We stayed at the MGM for the night and there was a virtual called "In the Belly of the Beast."
We also did the Welcome to Vegas. They were expanding the parking around the sign. We even saw Elvis there on the phone.
We ended up exploring the industrial area around the airport as we still had our rental car. So before turning in out car, we did some caching. We did many nano (small) geocaches- some on mail boxes, light poles, parking structures).
Our long weekend netted us 307 geocaches bringing our lifetime cache found number to 1,700!