Plain and simple,
what we do/know best, our preference.

Suggestion.

I think this is hard to translate because it's a play on words. 'E a minha praia' is obviously an idiomatic expression in Portuguese meaning 'it's what I like', 'it's what I'm into', but in this case I think it's also referring to the rivalry between Rio and São Paulo: Rio has its beaches, São Paulo city doesn't, but does have more culture to offer. I think it's very hard to get both of these ideas in a translation, but maybe somebody will think of a way.

My suggestion includes the idea that São Paulo is the best city for culture by using 'our thing', as though no other city compares.

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Note added at 22 mins (2011-10-25 01:03:14 GMT)
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Another idea might be "Culture, it's right up our street". This is both an idiom meaning, 'it's just what I like' and also plays on the fact that São Paulo is a city.

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Note added at 1 hr (2011-10-25 01:46:29 GMT)
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Another thought: 'Who needs beaches with culture like ours?' to try and get more of a flavour of the original.

:)

é a nossa praia => culture is us

Preparing Ourselves for Freedom: Culture and the ANC ...
www.jstor.org/stable/1146119
Culture is us, it is who we are, how we see ourselves and the vision we have of ... not the case-culture is us, and we are people, not things waiting to be put into ...

Art is a passion, Culture is us. Help build an Arts & Culture ...
www.refresheverything.ca/kettleandstonypoint
Vote for the most refreshing ideas to win Pepsi Refresh Project grants for Arts and Culture.

21 Definitions Of Culture In One Word From Cross-Cultural Twitter ...
www.cindyking.biz/21-definitions-of-culture-in-one-word/ Culture is infrastructure – @tdebaillon; Culture is communication – @DR4Ward; Culture is awareness – @XCulture; Culture is us – @jackyan ...

Culture, Pedagogy and Assessment: A View from the Bridge
www.menninconsulting.com/resources/viewFromBridge.ppt
Culture Is Us A Challenge to the Culture of Health Care in the US. “…what is clear to me is that we cannot fix the problem by adding 32 million people to the mix ...

e.g.,

So why do we care so much about our culture anyway?
For one it’s what we do. Second, well, it’s all around you.
http://www.actra.ca/main/takeitpublic-we-dare-ya/

TTYU Retro: Culture is what we DO
The word "culture" sticks out to me. In almost any context where I see it, it makes me curious, and makes me want to comment.

So what is culture?

Well, whole classes have been dedicated to this topic, as you might imagine. Probably one of the first things that comes to mind is "high culture," what we mean when we say someone is "cultured." Art, music, theater, etc. The finer things in life. That's certainly one of its meanings, but it only captures the tiniest part of what culture really is.

Culture is what we do
http://talktoyouniverse.blogspot.com/2011/02/ttyu-retro-cult...

In other words, culture is formed through practices, shaped by desire for a kingdom. Culture is more a verb than it is a noun. Smith writes, “Culture is not ‘out there’; it’s what we do.”
http://johnthenry.wordpress.com/2011/10/

No particular reason, just what first came to mind!

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Note added at 1 day12 hrs (2011-10-26 13:09:00 GMT)
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Oh, I didn't see yours, Tobias. :) Or perhaps I did and it subliminally registered!