Autumn hike on the Byzantine path on the slopes of Mount Pangaio to the Holy Monastery of Panagia Eikosifoinissa, described by the organizer as the oldest still-active monastery in Greece and Europe, with environmental talks on the area's ecosystem and flora by Ioanna Porfyllidou along the way: 4.5 km, 360 m height difference, about 2 hours. The day ends in Krinida (Serres) at the «Tea House» of herbalist Giannis Zalidas, with a one-hour tour of the botanical garden (100+ herb species), a talk on their properties and hot tea. €40 includes van transport, the guided hike, the garden tour and tea; €20 if you come with your own car. Friends from other towns can board the van along the route by arrangement. Limited van seats, book early. Info and booking: +30 6987 093730 (Ioanna Porfyllidou).