While not techincally a port I decided this was the best place to put this. We have chosen Porto, Portugal as the place to spend 4 days between two different cruises next summer. I have an apartment booked (very reasonable) and I have also booked a day trip to the Douro Valley including 2 wineries and a river cruise. What other not to miss things should we see in Porto. (This is sandwiched between a Rome/Greece cruise and a Norway cruise out of Amsterdam ha ha)