I will be in San Sebastian for 4 to 5 days in late May, visiting my son who is on a study abroad program. Looking to rent through AirBnb, great tips on must do/see while I am there? Thank you!
This article can whet your appetite, but the practical details are in Rick's Basque Country Snapshot, excerpted from his larger Spain book. If your son has been there a while, he's probably familiar with the main visitor spots. Eating is certainly a highlight, at pintxo bars and restaurants started by chefs who have come from the multi-Michelin-starred places in the region. A side trip to Bilbao to see the Guggenheim museum (Frank Gehry architecture, changing exhibits) is easy by bus (1.25 hours each way) or train (2.5 hours).
Make sure you get to the Guernica Peace Museum
http://www.museodelapaz.org/en/index_en.php
We took an enjoyable, easy day trip by public bus to Hondarribia.