Apollonia - Kamares
This trail is the old donkey route that connected Apollonia to Kamares. Kamares has always been an important port in Sifnos. Walking it downwards is easy and enjoyable, and the trail itself as well as the view of the gorge are very interesting. At about mid-way, you will pass by the church of Panagia Platanissa (or Platanou).
Source: www.sifnostrails.com