We have a time-share in Las Vegas, spent the whole day there on a couple occasions, lots to see between the red rock formations and the petroglyphs, with Lake Meade in the background, driving and/or hiking. March/April time frame should be good, a bit too hot after early June.
remember SCTT/Lake Perris is March 26-29
There a place to camp just East of Valley of Fire too.
It's free camping. Just a hard rock open area with view that's not to bad.
It on the road to Hover Dam and Overton, NV I think. It's on the map if can find my map. LOL
If things get dull there Las Vegas only fifty miles or so down the road...