We always stay at Sparks Marina RV Park. Level concrete sites with astro turf grass. Sites aren't very big and if you don't want to unhook your toad, they will put out some orange cones for you. No washing of vehicles allowed. Short walk to the Marina in one direction and shopping/restaurants in the other.
One word of caution...when turning off of McCarran blvd onto Lincoln Way, it is a very tight turn and if there is somebody waiting to make a left turn off of Lincoln, you may have to wait for them to get out of the way. We find it easier to go down to the stop light, turn right, and then turn right again and go back to Lincoln way from the other direction and make a left onto Lincoln. If you're in your toad....not a problem.
Ron