Three-day mountaineering trip on Olympus over the Holy Spirit long weekend, with two nights in mountain refuges. Day 1 (Sat 19 June): early departure from Athens to Litochoro and on to Gortsia (1,100 m), then up through beech forest and ancient Bosnian pines with views of the Aegean to the Petrostrouga refuge (1,925 m): about 5-5.5 km, +825 m, 3-4 hours. Day 2 (Sun 20 June): from Petrostrouga up to Skourta (2,485 m), along the Laimos ridge and past the Giosos pass to the Plateau of the Muses below Stefani, ending at the Giosos Apostolidis refuge (2,697 m) for the second night: about 5-6 km, +800 m, 4-6 hours with stops. Day 3 (Mon 21 June): start at 05:00; main route to Profitis Ilias (2,803 m) with its stone chapel and views of the Plateau of the Muses, Stefani and Mytikas; optionally, the ascent of Mytikas (2,918 m), the highest peak in Greece, with extra mountain guides and technical gear. Then back past Skourta and Petrostrouga down to Gortsia and the coach to Athens: about 12-15 km with about 1,700 m of descent, a demanding mountain day. The Mytikas ascent needs real effort, no fear of heights or exposure and previous mountain experience; it is offered for an extra €85 per person (mountain guides who secure the route and safety gear) and only with suitable experience and conditions. Included: all transport and the guide's accommodation, 2 nights at the Petrostrouga and Apostolidis refuges, helmets and harnesses for Mytikas, certified mountain guides. Not included: breakfasts and dinners, paid at the refuges (bring cash), and the €85 Mytikas option. Bring a 35-45 L backpack with rain cover, sleeping bag or liner (personal sheets are required at Petrostrouga), towel, hiking boots, poles, light refuge shoes, waterproof/windproof jacket, fleece or warm jacket, hat and gloves, headlamp with spare batteries, power bank, personal first-aid kit, at least 2 L of water, energy snacks, sunglasses, sunscreen and a cap; extra gear may be needed if there is snow. Limited places: the page says up to 35 participants (36 in its header). A deposit is due within 7 days of booking (€120 per the booking section, €135 in the page header), refundable up to 15 days before departure; the balance is due 7 days before departure, by bank transfer. The guides may change the programme. Contact: info@pezoporistas.gr, +30 697 417 0003.