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Photo: The Slate Caverns, CC BY-SA 4.0 via Wikimedia Commons
One of the most popular attractions in North Wales. Two underground tours describe the lives of the 19th-century miners. Plenty to see on the surface too. It's all done very well - this is a great place to spend a half day.
Llechwedd is a visitor attraction near Blaenau Ffestiniog, Gwynedd, Wales. It details the history of slate quarrying in the town and specifically the Llechwedd quarry in which it is located. The main aspect of Llechwedd is its Llechwedd Deep Mine Tour which has the steepest narrow gauge railway in the UK and travels over 500 feet (150 m) underground to the disused slate caverns, and the Quarry Explorer Tour which heads out to the furthest reaches of the Llechwedd site to explore the history of mining in the area.
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The National Mountain Centre, Capel Curig. Offers courses in hillwalking, rock climbing, kayaking, canoeing, orienteering, skiing and more. The centre has a pool, climbing walls, ropes course.
Connecting Porthmadog, Beddgelert and Caernarfon, as such it crosses the northwestern peninsula of the park.
Climbing and scrambling courses in Snowdonia.
Departs from Llanberis. This spectacular 4 mile, roughly 2½-hour train journey climbs 3500 feet up Mount Snowdon and is the only rack-and-pinion railway in the UK, dating to 1896. Trains depart first at about 9AM. There is a 30-minute stop at the summit; the train leaves again promptly, so make sure you are back on time! It costs £60 for a roundtrip, discounted if the first train of the day is taken, or if you go one way. Open mid-March to October, several trains a day, more in summer. Be prepared to wait several hours after buying your ticket.
Runs from Blaenau Ffestiniog to Porthmadog. The trip is about 13 miles long.
Frongoch, Bala. White-water rafting and canoeing on the River Tryweryn. The flow of water in the river is governed by a dam controlling the flow of water from the Llyn Celyn reservoir, meaning that conditions in the water are predictable - though this does not make the experience any less exhilarating once you are on the river.