Two-day hiking trip in the Pieria mountains and Lower Olympus, with a night at the EOS Katerini refuge in Ano Milia. Day 1 (Saturday 5 December): leave Xanthi at 06:00, arrive at the refuge around 10:00 and start straight away for the Pente Pyrgoi summit (1,710 m), a cluster of rock towers: 5 km and about 700 m of climbing (about 3 hours) to the top, then back via the 1997 Yak-42 crash site, another 9.5 km (3.5-4 hours); 14.5 km in total, +822 m / -822 m, 6-7 hours; dinner and night at the refuge. Day 2 (Sunday 6 December): after breakfast drive to Ano Skotina and from about 09:30 hike to Lake Kati (1,355 m), a small artificial mountain lake on the Pieria-Larissa border: about 8 km each way, +772 m / -37 m on the way up, 3-3.5 hours each way, back on the same path; departure for home by 17:00 at the latest. Distance and climbing shown are for both days. Runs with at least 5 participants; price per person depends on group size (5-6 or 7-8 people). The price includes civil liability insurance, an experienced guide, the night at the refuge, Saturday dinner and Sunday breakfast, and group transport from/to Xanthi and the stops on the way. Bring: hiking boots, a 40-50 L backpack, water and food for the hikes, waterproof and windproof jacket, fleece and warm jacket, thermal layers, hat and gloves, head torch with spare batteries, personal medicines; hiking poles recommended. Booking: call first, then pay a €100 deposit by bank transfer to the company's National Bank of Greece account (reference «Πεζοπορία στα Πιέρια») by Tuesday 1 December and email the receipt to nes.rod.th@gmail.com. Contact: +30 6989 474844 (Ioanna Porfyllidou, Vasilios Georgiadis), info@leivaditis.gr.