Central building of the Carpathian Biosphere Reserve is notable for two things: Museum of Ecology of the Mountains (read more at the website) and an eco trail to the mineral water source.
If you get to the the water source you will see spectacular scenery.
Getting there: Southern exit from Rakhiv. Go to Rahiv either by train from Lviv or Ivano-Frankivsk or by minibus from Ivano-Frankivsk.