Looking at the OS map, Anglesey looks to about the size of the Lands End peninsular (i.e. a single sheet). Easily do-able in a day by car, assuming the roads are reasonable. If I've got this completely wrong, please let me know!

Barclodiad-y-Gawres I'll take a view on when I'm there. In fact, I'll have to do that for most of the sites as my knee is playing up a bit at the moment. Tombs are good, but I've also marked lots of single stones on the map, so it may be a question of just getting a view of some of them, as opposed to getting to spend any useful time there, especially if parking is a problem (as I see some fieldnotes mention).

As for the Moth/Jane dichotomy, I've taken both approaches in the past, and have to say there's nothing wrong with either - it just depends how the mood takes me on the day!

Likewise Din Lligwy. It's a bit of a haul-ass walk and taking time to look around is needed I think.

A good spring day should be enough for the main circuit. A summer day and you'd be sound for the whole list.