One possibility:

Take a pair of rose shears with you on your hike, cut away bushes that are in your way and clear overgrown signs so that they can be seen from afar again!
 
Good opportunities for this are between:

Planitero and Armpounas (2nd stage)
Ladonas spring and Pagrati, as well as Krinofita and Likouria (3rd stage) 

Dolianitis bridge and Ano Doliana (8th stage)
Parori and Metamorfosis Sotiras chapel (11th stage)
Arna and Panagia Jatrissa (14th stage)

Thanks for your help !!!