There's a couple things you can check out that are kind of cool. The Atomic museum (or something like that) and the museum of science (or museum of natural science, i forget).

Oh and in Henderson (which is attached to vegas basically), The District, which is an actual neighborhood, but it's also a commercial center with bars, music in the streets live bands and stuff, sometimes parades and all sorts of cool things. The residences are above the shops.

You can always check out the fucking ghettos, maryland parkway and sahara/flamingo area. You can always buy crack there. You can also get into a gang war if you choose.

Up spring mountain road (west), korea town. Plenty of asian massage places and alot of resteraunts. It goes for miles.

Up Desert Inn road (west) you'll come across desert breeze skate park. Alot of times local bands come and set up and play for everyone. The biggest concerts in vegas are held there, multi-stage type. Also fun to go watch the kids break their necks.

West on Charleston blvd in Summerlin is Boca Park, big snobby rich person commercial center. But there's a cheesecake factory, and live music and stuff. Very high class and fun to fart around.

There's always Lake Mead. Fuck the hoover dam. The fish there are mutants though. They'll eat you.

Fremont is a cool place to visit if you aren't afraid to get shanked/mugged/raped. There's the Fremont street experience.