Setting off from the long stretches of sandy beach in Trestraou, you can follow the customs trail to reach Ploumanac'h. This is the best way to get close by the pink granite chaos and its astonishing forms, specific for this exceptional coast  that carries their name. The « dice », the « witch », « Napoleons hat », are the great classics, but the granitic heaps, some towering at 20 meters heights, are conducive to all kinds of daydreaming. 
Ploumanac'h is an unforgettable site not to be missed out. Ever changing light keeps on re-inventing the perfect harmony between the limpid blue of the sea and the pink, even orange! of the granite rocks sculpted by erosion. Adding to the magic of the site, the Costaères castle, built on a simple little island by a Polish engineer in the late 19th century, silhouettes its gothic outlines against the horizon. It is the emblem of this coast and still bears the memory of famous hosts, like the writer Colette.
On the open sea, the seven îles bear Brittany's most ancient bird sanctuary. This group of rocky islands is a protected natural site since 1912.  In 1977, it has been declared a Nature Reserve.
The Ile Rouzic shelters the unique colony of Nothern Gannets. Herring gulls, shags, Atlantic puffins, guillemots, ...they all nest in shady cavities and little creeks, and a herd of a dozen grey seals has settled down here, as well.