Oodnadatta is a small town in South Australia.
The Ghan railway line used to pass through and stop in Oodnadatta. The railway line now bypasses the town but the old station is largely preserved and is a museum. The old rail line runs (for the most part) way out to the desert it is advised not to stray too far. It's pretty overgrown and scrubby, so it's not a pleasant walk either.
The Oodnadatta Track, Australia is an unsealed 620 kilometre track between Marree and Marla via Oodnadatta in South Australia. It passes the southern lake of the Lake Eyre National Park. Take note, that most of the lakes around, are mere dry saltbeds. The maintained roads rarely go close enough for a good view, and the roads that do approach the lakes have a risk of getting bogged.
The town provides a selection of both pub food and roadhouse food. You choose.
The nightlife in Oodnadatta won't keep you dancing all night, but you will have no problems getting a beer.
Down the track a couple of hundred kilometres to William Creek and Lake Eyre, or up the track to the Stuart Highway at Marla and on to Alice Springs.