There's a care home on part of the site of the former West Wales Isolation Hospital, but it's not clear which of the two distinct sets of building it might be. On the lower site one of the original hospital buildings has been retained.

Altnabreac station currently closed indefinitely from early Nov 2023. The owners of the house adjacent to the platform are obstructing access. See various news reports: https://www.northern-times.co.uk/news/couple-at-altnabreac-could-be-real-reason-behind-mystery-clo-333609/

https://www.johnogroat-journal.co.uk/news/exclusive-we-wont-be-bullied-out-of-our-home-say-altnabre-333922/

and thread(s) on UK Rail forum:

https://www.railforums.co.uk/threads/network-rail-denied-access-to-altnabreac.245714/

https://www.railforums.co.uk/threads/no-trains-to-call-at-altnabreac-for-the-foreseeable-future.257526/

Sand seems a bit unlikely as a natural area on a ridge line. Is this rock decaying in situ so that the debris is mainly small particles?

Several unconnected sections of path with description=Gamsteig. I think this may be SAC scale T4 (alpine_hiking) from trip reports on Hikr, but looks as if no OSM mapper has actually followed this line. I find the traces marked quite difficult to pick out on aerial imagery: are they just animal trails?

Details need checking here, seems to go through a house. (I may have waypoints for path crossing Fosse)

Mapping of relative occupation of this building by sports centre and library would help in showing both features