In reply to Tris: That, nice as it sounds, it's not quite the Basque Country. Look up Atxarte and Egino, enough to last you a few months if not years. Nearby in Navarra you have Etxauri (close to Pamplona) and in between Dos Hermanas, two limestone towers by the motorway with great lines. Desnivel.com if you have a smattering of Spanish have a crag guide. Lovely climbing in Ogoño, great limestone seacliffs but bird restrictions apply I believe. Txindoki is higher and will be cooler, nice climbing there too.
Smaller, more obscure stuff on the french side (check euskalade.com).
you can expect humid, suffocating heat, and a fair amount of rain if you are not lucky.
I won't mention the Baltzola cave as such stratospheric grades are entirely alien to me!