open water swimming and zip lines. Indoor activities include high ropes, caving and ninja assault. There’s even a hotel on site: the 106-bedroom Hilton Garden Inn Snowdonia. An ideal day out for ...

zip lines and flooded chambers. Deep Sleep is located in a disused Victorian slate mine below Snowdonia in Wales. Guests can stay in log cabins or slate-roofed chambers - dubbed "the deepest sleep ...