Portugal and Azores

Hello! Looking for friendly feedback if this is enough days in each place or if there are any suggestions of other places to go. This is my and fiancés first time out of the country and on a real vacation so super nervous and excited! I’m an early planner, planning for July/August next year. I know that’s the busy season but it’s all that works with our work schedules and a month or so after the wedding. I don’t have all the details laid out yet and where we exactly will go and eat but just the basics. I am thinking we definitely won’t rent a car in Porto and Lisbon but will on Sao Miguel Island. We are thinking Porto and Lisbon will be a busy schedule and the Azores will be more laid back, not rushed and mostly relaxing but want to make sure that’s realistic! Thank you in advanced!

• Fly into Porto, stay 3 nights. We will have about 1.5 days of exploring Porto and one day trip to Douro Valley.
• Train from Porto to Lisbon, stay 4 nights in Lisbon. Two full days of exploring in Lisbon and one day trip to Sintra (wondering if I should do 4 nights in Porto and 3 nights in Lisbon instead?)
• Flight from Lisbon to Azores (Sao Miguel) staying 7 nights. We will have 6 fulls days, is that enough?