Itinerary Advice - Spain/Portugal

Hey everyone,

Wondering what you all think of the following.

I have 8 days to spend in mid/late June in Spain/Portugal and the 3 places/cities that we (my wife and I) are most interested in are San Sebastian, Porto, and Lisbon.

I'm thinking it'll probably be rushed if we do all 3 in that amount of time, so I'm looking to narrow it down to 2 of the 3, but am having trouble.

We're in our early 30s and enjoy a ton of different things including: food - restaurants/bars/coffee shops, culture/sightseeing, walking around cities, beaches, hiking/nature, night life and more.

Any and all thoughts and or suggestions would be greatly appreciated!

Thanks!