Do not book the onboard excursions very expensive.
Lisbon you can get a taxi or train next to port to the beach which is well worth a visit, hopefully weather will be good. Don't know about much more.
We are also going on this cruise, can't wait we're praying for good weather thr biscay and for the rest of the wk. Have fun, we've been on 7 cruises now and they are wonderful !!! you'll be booking again and agai.