The Grey Corries hike is a 9-10-hour hike across 3 incredible Munros. The landscape is a blend of green (or orange, depending on the season) and mostly grey (hence the name). It's fairly steep & rocky, with some scary ridgelines, but so worth the view if you're up for the adventure. This is definitely not a beginner hike though, so please take it seriously, and only go if you are able & the conditions are good! There is no public transport to reach the beginning of this hike - for more info, follow the link.