Na quarta-feira, eu e minha prima vamos tirar uma foto na ponte perto da avenida principal.

Yes. Here, na is the contraction of em + a.

• em often covers meanings like in / on / at
• a is the feminine singular definite article the

So na quarta-feira literally looks like in the Wednesday, but the natural meaning is on Wednesday.

In Brazilian Portuguese, talking about days of the week, you will often hear both:

• na quarta-feira
• just quarta-feira

Both can be natural, especially in speech.

In Portuguese, days of the week are normally not capitalized, unless they begin a sentence.

So:

• segunda-feira
• terça-feira
• quarta-feira

not Wednesday-style capitalization.

The hyphen is part of the standard spelling of these weekday names from Monday to Friday.

Both are possible.

Traditionally, some teachers prefer minha prima e eu because it sounds a little more polite or formal to mention yourself second. But in everyday Brazilian Portuguese, eu e minha prima is very common and natural.

So:

• eu e minha prima vamos... = common, natural
• minha prima e eu vamos... = also correct

Because the subject is eu e minha prima, which means my cousin and I. That is we, so the verb must be in the first person plural.

• eu = I
• eu e minha prima = we
• vamos = we go / we are going

So vamos tirar means we are going to take.

Because possessive words in Portuguese agree with the noun they describe.

• prima is feminine singular
• so the possessive must also be feminine singular: minha

Compare:

• minha prima = my female cousin
• meu primo = my male cousin

So the possessive matches prima, not the speaker.

This is the very common ir + infinitive future construction.

• vamos = we are going
• tirar = to take

Together, vamos tirar means we are going to take.

This is extremely common in spoken Brazilian Portuguese. A more formal or less common equivalent would be:

• tiraremos uma foto = we will take a photo

But in everyday conversation, vamos tirar sounds much more natural.

Yes, tirar has several meanings, and one of its common uses is in the expression tirar uma foto.

So even if the literal logic feels different from English, this is simply the normal Portuguese expression for to take a photo.

Useful comparison:

• tirar uma foto = to take a photo
• tirar o casaco = to take off the coat
• tirar algo da bolsa = to take something out of the bag

Same verb, different common uses.

Because uma foto means a photo, and that is the normal full form here.

• tirar uma foto = take a photo

In informal speech, Brazilians may sometimes say tirar foto, without the article, especially in casual contexts. But tirar uma foto is very standard and clear.

These are contractions, which are extremely common in Portuguese.

• na = em + a
• da = de + a

So:

• na ponte = on the bridge / at the bridge
• da avenida principal = of the main avenue

Because ponte and avenida are feminine singular nouns, they use a, which creates these contractions.

Compare:

• no parque = em + o
• do parque = de + o

Because perto normally goes with de:

• perto de = near

When de comes before a avenida, it contracts:

• de + a = da

So:

• perto da avenida principal = near the main avenue

This is a very common pattern:

• perto da escola
• perto do banco
• perto de casa

Notice that with casa, the article is often omitted in some contexts, so you may see perto de casa.

Because in Portuguese, adjectives usually come after the noun.

So the default order is:

• avenida principal = main avenue
• foto bonita = beautiful photo
• ponte velha = old bridge

Putting the adjective before the noun is sometimes possible, but it often sounds more literary, emphatic, or changes the nuance. For a basic descriptive phrase, avenida principal is the normal order.

Yes, ponte usually means bridge.

In this sentence:

• na ponte = on the bridge / at the bridge

The exact English translation can vary depending on context, but bridge is the core meaning.

Also note:

• ponte is feminine
• so you get a ponte, na ponte, da ponte

It is natural and correct, especially in writing.

Na quarta-feira is a time expression placed at the beginning of the sentence, and Portuguese often uses a comma after that kind of introductory phrase for clarity.

So this is good:

• Na quarta-feira, eu e minha prima vamos tirar uma foto...

In short sentences, some people may omit the comma, but keeping it is a good habit in writing.