Porto is a beautiful city with plenty to see and do. Here's an ideal itinerary for 3 days in Porto:

Day 1:

Start your day by visiting the iconic Clérigos Tower, which offers stunning views of the city. After that, head to the Livraria Lello bookstore, known for its beautiful architecture and as an inspiration for J.K. Rowling's Harry Potter series. Next, visit the São Bento train station, famous for its intricate tile work. From there, take a stroll through the historic Ribeira district, located on the banks of the Douro River. End your day with a delicious dinner at one of the many restaurants in the area.

Day 2:

Begin your day by taking a tour of the Port wine cellars in Vila Nova de Gaia, where you can learn about the history and production of this famous wine. After the tour, enjoy a tasting and take in the beautiful views of the Douro River. In the afternoon, visit the Palácio da Bolsa, a stunning neoclassical building that was once the stock exchange. End your day with a relaxing walk along the Foz do Douro beach, where you can watch the sunset over the Atlantic Ocean.

Day 3:

On your final day in Porto, start by visiting the beautiful gardens of the Serralves Foundation, which also houses a contemporary art museum. Next, head to the Casa da Música, a modern concert hall designed by renowned architect Rem Koolhaas. In the afternoon, explore the trendy Cedofeita neighborhood, known for its boutique shops and cafes. Finally, end your trip with a traditional Portuguese dinner at a local restaurant, where you can savor the flavors of the region.

I hope this itinerary helps you make the most of your time in Porto!