Well, it's a path that people walk on. What's the best tags for that?

There's a bit of info on the beach page: https://wiki.openstreetmap.org/wiki/Tag:natural%3Dbeach#Mapping_path/track_using_beach_as_its_part

Some tag ideas for the path: 
highway=path (or highway=footway)
surface=sand
foot=yes
tidal=yes
intermittent=yes
hazard=tide

My main part I was checking was if it existed still, or if it was eroded by waves. Recent social media pics show people using it to walk from the upper two island to the lower one, indicating it still exists and is in use.