Cadair Idris via the Minffordd path
This classic circular walk in southern Snowdonia is well worth doing, particularly if you can catch a clear day and get views down to the valley and the glacial lake that sits at the centre of the route.
There are two options for parking as far as we know and starting off the route. Either use the national park car park, or the campsite should be happy to let you park: https://www.walestouristsonline.co.uk/snowdonia/campsite/Cwmrhwyddfor.html
We actually left the car overnight with the above campsite as we were on a longer hike, and the campsite were happy for us to leave the car at a nightly rate, as the main carpark is paid by the day.
The walk starts steep and heads through woodlood past Nant Cadair falls, then heads round and up the glacial valley to Lyn Cau.
At this point the path heads around the ridge in a clockwise direction along rim Craig Cau to Penygadair, with Llyn Cau down below on the right. This is when you need a great day, as the views are extensive.
Following the ridge around, you'll come across the main trig point and a stone refuge, which is handy on a cold and wet day.
The route down after passing along the ridge on the more northerly side gets quite steep with quite a bit of scree. Eventually it joins back up with the original path to complete the loop, crossing over the Nant Cadair river and back down towards the carpark/campsite.
Dolgellau is the nearest town a few miles north of Minffordd, and has some really nice cafes and independent shops. The route up Cadair Idris can also be tackled from Dolgellau, however it's the longer route although not as steap.