LV is one area I do know...
Wendy,
One of the coolest things about Las Vegas is... Within five driving hours of the famous LV strip, you can easily be in five different national parks. If you have never seen Death Valley -- it is an awesome place. If you go to our <a href = "http://www.roadtripamerica.com/links/nparks.htm">national parks</a> page -- you can find some useful tips for planning roadtrips.
Zion, is gorgeous in any season. I have driven to Zion from LV a number of times for the day. Along the way, be sure to stop at the Reservation store at the turn-off to <a href = "http://parks.nv.gov/vf.htm">Valley of Fire</a> -- the most amazing collection of fire works you are ever likely to see. And you can test some of the rockets or motars out back.
Speaking of Valley of Fire regional park -- in January you are very likely to see one of two of the juvenile bands of mountain sheep that wander around the park. Valley of Fire has some of the most fantastic sandstone coloration anywhere in the country. Backdrops from this park can be found in just about every type of new car ads and plenty of rock-n-roll CDs.
<a href = "http://www.roadtripamerica.com/places/grapevin.htm">Petroglphys</a> and other native Indian artifacts are easily found around Las Vegas. Grapevine Canyon near Laughlin is only about an hour south of Las Vegas. There is an incredible gold mine exploration tour near <a href ="http://www.desertusa.com/oatman/du_oatman.html">Oatman</a>, CA on the historic Route 66.
Hard Hat tours are no longer possible at the Dam, but the tours from the Nevada side are still available. Plus the structure is awesome.
Mark