There is free and open access to both Parys mountain and Amlwch port.
Self guided tour leaflets available for a small fee either from the mountain car park or the Sail loft.
However to gain maximum advantage from your walk why not book a guided walk with one of the trained guides.
They will be able to bring the history of the area to life.
Details of the service they offer and contact details can be found via their own web site.