Camino Finisterre

Hello! I'll be walking the Camino Finisterre this summer and decided I'll go for 4 days (instead of 3). My stops will be Negreira, Mazaricos (A Picota), Cee, Finisterre and then another walk or maybe bus to Muxia and back to Santiago.

Any advice or anything I should not miss on this route (food, landmarks etc)? I've booked my all my stays at private hosts/albergues, wondering how popular this route is in the summer and if there's anything to do in the towns along the route?

I'll probably want to also spend half day or so at the beach, which one is the best one near Finisterre? Thank you!