Summerholiday in Portugal, looking for do's/dont's

Hello people! I'm thinking about going to Portugal this summer. I've never been in Portugal, any Portuguese people here with info?😃

Good destination dear! 😃 i had the same idea for this summer

But where to go? What area's to avoid or definitely must- sees? 😃

How long you plan on staying there?
I wanted to go to the Azores, but i found that get there it's very difficult. Best destinations are: Lisbon obviusly, charming Sintra, Coimbra, and Oporto (where was born my favourite wine "Porto")

I'll look those place up! Thanks!