Anglesey’s network of public footpaths, including the coastal path, is clearly marked on these maps.
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Map 262 Anglesey West / Gorllewin Ynys Môn
£7.99 (plus 60p postage within UK)

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Map 263 Anglesey East / Dwyrain Ynys Môn
£7.99 (plus 60p postage within UK)

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The OS Landranger maps, 1:50000 (2cm : 1km — 1¼in : 1mile),
are best for road users.
A good map of the whole island (including part of the mainland) is:
Map 114 Anglesey / Môn
£6.99 (plus 60p postage within UK)
For the mainland (Bangor and Caernarfon, including northern Snowdonia)
together with part of southern Anglesey:
Map 115 Snowdon / Yr Wyddfa
£6.99 (plus 60p postage within UK)
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