What sort of difficulty? Potato ridge aka rocky road to red rocks is a great half day trail with enough to keep it interesting on the 160 out to Pahrump. Goodsprings trail runs from Jean on the I15 over to the 160, nothing difficult but a nice scenic drive 2hrs tops. Devils canyon, to the left of the I15 just before Jean, an old mine trail that climbs up into the foothills, has a great challenging wedge and some good steps 2-3 hrs and fairly technical. Bitter springs trail, goes from the valley of fire (50 miles north of vegas on the I95) and brings you out on Lake mead shore road. Logandale trail network. Or just head up onto Mount Charleston and pick any number of trails, google earth works well here for plotting coords and it will be about 20 degrees cooler then in the valley. Let me know and i'll give you some more details.
From stock to big rock just enjoy what you got