Hi misspenn!
Me again.
To be honest i don't know much about Biarritz as never visited; but it was the place to be along the coast at one time.
As i am in the same sort of position as you i wonder if you had considered this?
I land in Biarritz from UK on the 14th May at 18.45 so i decided to taxi to Bayonne and i am staying at Hotel Cote Basque just across the square from the train station.
I plan to get up early on the 15th and explore some of Bayonne and catch the 12.35 train to SJPP .
I start walking on May 16th my 70th birthday; doing the Valcarlos route. (mainly cos of my vision)
Walking to Burgos this time out to Bilboa then fly to Faro taxi to the coast where i will have a week based in Fuseta between Olhoa and Tavira.
I put the last bit just because:
You came from the Algarve to start your Camino; i am going when i finish mine!
We are both Taurean (bulls) as blind as bats
Anyway whatever choice you make HAPPY BIRTHDAY for the 19th!
Buen Camino
Woody