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Albufiera used to be a small town gem about 20 years ago but now the vacationing Brits have turned it into party central and it feels more like a giant disco sports bar now. I saw it first in about 2005 and it had a lot of historic charm. Then I saw it again in about 2015 and it was drastically changed with whole streets filled with sports bars and discos. Be careful in the weekends there because the streets are filled with drunken tourists. It was like New Orleans during mardi gras ..... every weekend! As exciting as it may sound to tourists, the locals absolutely hate it and judging from the last time I was there they hated the tourists, especially the Brits.

Portimao, to the west is a quieter and more Portuguese location with better and larger beaches and more traditional and cultural appeal.

I'd avoid Albufiera because of the bar scene (which can be had anywhere in the world), unless that is what you are looking for.

Seville will be amazing and beautiful .... head to Malaga and Granada if you have the chance. Malaga is beautiful this time of year because there aren't that many people and you can enjoy their huge Malagueta beach next to the city.