Just don't take a stroller into the Bellagio!! 
Your kids are slightly older, so they might enjoy some of the roller coasters at the hotels. Most of the hotels on the strip had something kids would enjoy seeing or doing - though fairly expensive, as most touristy places are. We took Russ for an overnight on the way to DL when he was 18 months old and no one handed us the porn cards - they were out and about but didn't approach us. But then, Russ was young enough that even if they did, it wasn't an issue. And we were back at our hotel by 9 pm so we weren't out for the late-evening stuff.

Your kids are slightly older, so they might enjoy some of the roller coasters at the hotels. Most of the hotels on the strip had something kids would enjoy seeing or doing - though fairly expensive, as most touristy places are. We took Russ for an overnight on the way to DL when he was 18 months old and no one handed us the porn cards - they were out and about but didn't approach us. But then, Russ was young enough that even if they did, it wasn't an issue. And we were back at our hotel by 9 pm so we weren't out for the late-evening stuff.
