The Ötscherhias is a snack station in the middle of the gorge Ötschergräben.
Some hiking trails lead to and from Ötscherhias, for example starting from Wienerbruck, Erlaufklause or Mitterbach.
You can find hiking suggestions at:
https://www.mariazell-info.at/de/sommer-1/wandern/#3744181
https://www.mariazell-info.at/de/sommer-1/wandern/#24166548
https://www.mariazell-info.at/de/sommer-1/wandern/#15328192
May 1st to October 26th9 a.m. - 5 p.m.