Hello and Welcome to the forum.

In Algrave as mention there are lots of English which translates into lots of english speaking persons, lots of english food and I believe lots of job opportunities for and from the English...........

Cascais is also a very high English speaking area of Portugal offering the sea and sun besides being close to Lisbon.

I would suggest a week or two visit to both areas before deciding.

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Diane aka Mamacats
Ragdoll Breeder
Portugal