The other airfields that serve Vegas are North Las Vegas and, of course, McCarran. Last time I checked, McCarran still took VFR traffic.
Henderson is towards the southern end of Vegas and would probably be the best place to plan for. You can check the whole route using Skyvector.com or other such sites.
En Route (sight seeing wise...) SoCal probably has it spot on. There's not much to see. If you like airliners then Mojave or Victorville (both north of track) may be a place to stop for a de-fuel. If you want something scenic to see and a nice burger then Big Bear City is well worth a trip.
But again, as SoCal says, if it's July then be careful with your performance calcs - it does get very hot out there.
HTH
DD