Biarritz is like the French counterpart of Spanish San Sebastian. It is an extravagant coastal town with luxurious hotels and fine restaurants. We visited Biarritz for a short time with a Spanish Couch-host.
Our host lived on the Spanish-French border, and decided to accompany us as we continued our north trip from her house. We toured through the Basque country stopping in a few small villages, and finally stopping in Biarritz.
Like San Sebastian this city is beautiful but really only a fun place to stay an extended period if you have money. Obviously, we did not stay long.