Flutterby™! : Things to do in Las Vegas

So my sister is getting married in Las Vegas (I don't know either, when queried on the matter she said "well, it's better than Toledo", which is true, but...). I never thought I'd get near Vegas in my life, but it appears that that's gonna happen, so if anybody has suggestions on cool things to do and see in the area in late April, I'm interested. I don't know what the desert is like around there, or what's worth checking out, or even how the bloom is in that part of the season in that area. And who knows there may even be some stuff worth seeing in Vegas itself. While poking around to find prices on cheap flights to Vegas I discovered that Alaska Airlines runs on Microsoft products. Amazing what those crashes and error messages tell ya, huh? Sigh.