Tuesday-evening circular hike under the full moon on Mount Sivri above Oraiokastro. Starting just before dark, the path climbs through the Sivri forest with the view of Thessaloniki and the Thermaic Gulf opening up; at the top there is wine (juice for children) and a picnic with the city lights below. 6 km, +/-250 m (240 to 450 m), about 3 hours, difficulty 1/5, moderate fitness; ages 8+ with a guardian. Meet 17:10 at 1 Alexandrou Ypsilanti St, Oraiokastro (main entrance to the mountain), start 17:15, at the top about 18:30, picnic 19:00, back down by 20:15. €10 for adults, free for children 8-14; wine or juice included. Bring a head torch. Led by mountain guides (TEFAA graduates) with international first-aid certification; first-aid kit, radios, photos and video, VAT included. Free cancellation with full refund up to 48 hours before departure; full refund if the trip is cancelled or postponed for weather. Book on discovery-trail.gr; payment by IRIS or bank transfer. Contact: +30 698 697 4647 (Leonidas), +30 694 518 0393 (Dimitris), discoverytrailinfo@gmail.com.