Solitaire is a large dot on the NWR's map, but a small place. It is just a few buildings, run by the helpful, if idiosyncratic, Percy; but is so atmospheric, so typical of a middle-of-nowhere stop in the desert, that it's been the location for several film and advert scenes.
There is a fuel station here that is pretty reliable, and it is still the best place for miles to have punctures mended. The shop behind the garage opens all hours, selling quite a wide range of supplies (the best around, though that's no great praise). Superb fresh bread is baked on the premises, as is apple crumble, and most people stop for a drink and a snack. The storeroom at the back has a surprising range of wine. There's a campsite, too, costing N$20 per person, plus N$50 for the site.