Hi, we are traveling with a group of 3 couples to Porto in mid-October and looking for sites and things to do that shouldn't be missed along with recommended restaurants in Porto. We'd like to take a cruise down the Douro River and would like a recommendation of which cruise line and trip to take if someone has direct experience with one. We plan to be there for 4 days before heading down to Lisbon and will be staying at an AirBnB at the mouth of the river, in Granja De Baixo.
Thanks in advance!