Hi,
Some 5 years ago (the summer before the Prestige wreckage) we pushed our
Santiago travel further. From Santiago we headed SW: Bertamiráns, (plenty of
rural roads, pretty hilly with steep grades, no traffic) Os Dices, Padrón,
then stayed in a camping along the Ría de Arousa (Vilagarcia ? Not sure
about the exact place). From there we did a day trip up to the Mirador de la
Curota (wonderful view). Then we followed the coast in a clockwise way:
Rianxo, Pobra do Caramiñal, Ribeira, Noia, Muros, Corcubion, Fisterra, Cabo
Fisterra, Cabo Touriñan, Muxia, Cabo Vilán, Laxe, Malpicá, La Coruña.
In general: traffic was light, there were plenty of camping opportunities
and small hotels, great beaches in remote places (the oil spill hadn't
destroyed the place then, I hope it recovered since), fantastic views, and
nice food. Actually, we found it better than the Camino de Santiago itself.
In some places (mostly along the Costa de la Muerte -- ie roughly from
Fisterra to a Coruña), you will find a dirt track running along the coast.
It is suitable for standard hybrid bicycles, fully loaded.
And last but not least: people are friendly !
Weather ? It was July, but the NW coast is known for its crappy weather.
Like a detached part of Scotland that would have drifted to the south and
carried its own microclimate with it. But you get also the sun on very
regular intervals. Bring sun cream and raining jacket, you'll use both.
For a four day stay, I think that you'll have to make a choice between the
costa de la Muerte, and the coast further south (rías de Pontevedra, Vigo,
etc). The first is wildest, has the less favourable weather, and a rugged
coastline. The second part should be more sunny, is more developped, carry
more traffic, and offers more leisure activities opportunities.
So make your opinion, and enjoy your trip.
Eric