“A Walking Guide to Aegina” by Gerald Ephraim Nektários Thompson is more than ten years old now and in need of an update, but still a good booklet with some hand drawn maps of more dubious quality. Lots of information (perhaps too much for a walking guide) about history etc built into the text makes it a bit hard to follow at points. But still I am certain you will have lots of fun with this one too! Available in bookshops on the island.