Breil sur Roya is a cute little town and we can spend the morning there.
The train des merveilles is going there and this is a very nice journey to get there. I am suggesting to take the train at 9.15am arriving there at 10.17.
We would then take the train to La Brigue that leaves at 13.12 and arrives at 13.57.
(Nothing to do with photography but there might be a museum worth the visit: Le musee du patrimoine.)
To come back there is a train leaving from La Brigue at 17.05 and arriving in Nice 18.42
It should be an active day again!