I am just returned from Mayo in Ireland. I have been there before and wanted to go again. It has everything for the touring cyclist from amazing scenery, excellent roads and welcoming people. Like Donegal, Mayo is on Eurovelo 1. These are some views in Mayo and neighbouring Connemara all on cycle routes.
This is how the routes are signed
I also like that motorists are told to give cyclists space such as with this sign
Mayo's scenery offers splendid isolation but also you are never far from a town or bar for refreshments. Westport is successfully creating itself into a smart town with cycling encouraged as this image
My plan is to return sometime soon and find more exciting bike rides and stunning scenery