c-m,
the ticket "office" is somewhere on the road there. If you want to have the exact location, just ask in one of the tour operators in Uyuni, they are very helpful.
You may get gas in Villa-Mar, but only from privat. No gasstation. So you should not count on it. If you are coming from Chile, get canisters there. We did not see a reasonable shop for that in Uyuni.
San Pedro is very touristic. Coming from Bolivia you may enjoy a working WLAN, good food and nice bars though...
The sorroundings are fantastic . The Moonvalley is really nice. Plus there are great tours for Astronomy (you#d have to book in advance though). A real highlight was the coppermine chuquicamate close to Calama.
So there is some things to do... as I said: pretty touristic though...
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