Mañana voy al ayuntamiento para renovar el carné.

Yes. Mañana means tomorrow, and it is often placed at the beginning to set the time frame right away.

So:

• Mañana voy al ayuntamiento... = Tomorrow I’m going to the town hall...

You can also move it:

• Voy al ayuntamiento mañana.

Both are correct. Starting with Mañana just sounds a bit more natural when the speaker wants to highlight when the action will happen.

Also, mañana is not capitalized unless it begins the sentence, because it is a normal noun/adverb, not a proper name.

Spanish often uses the present tense to talk about the near future, especially when the context already makes the time clear.

Here, Mañana already tells you the action is in the future, so voy works perfectly:

• Mañana voy al ayuntamiento = Tomorrow I’m going to the town hall

This is very common and natural in everyday Spanish.

You could also say:

• Mañana iré al ayuntamiento

That is also correct, but it can sound a bit more formal, deliberate, or written depending on the situation.

Because in Spanish, a + el contracts to al.

So:

• a + el ayuntamiento → al ayuntamiento

This contraction is mandatory in standard Spanish.

Examples:

• Voy al médico
• Vamos al centro
• Subo al autobús

One important exception: if El is part of a proper name, you do not contract it.

For example:

• Voy a El Escorial
  not al Escorial

But with el ayuntamiento, it is just the normal article, so al is required.

Ayuntamiento usually means town hall, city hall, or local council / municipal government, depending on context.

In this sentence, voy al ayuntamiento most naturally means going to the municipal building/office where local administrative tasks are handled.

In Spain, this is a very common word for the local government office.

After para when you express purpose—in other words, in order to—Spanish uses the infinitive.

So:

• para renovar = to renew / in order to renew

You do not use a conjugated verb after para if the subject stays the same.

Correct:

• Voy al ayuntamiento para renovar el carné.

Not correct:

• Voy al ayuntamiento para renuevo el carné.

A few similar examples:

• Estudio para aprender.
• Salgo para comprar pan.
• Llamo para preguntar algo.

Carné in Spain usually means some kind of card, ID, permit, or license, depending on context.

It can refer to things like:

• a membership card
• an ID card
• a driving licence
• another official card/document that needs renewing

In this sentence, without more context, it just means the card/document/license being renewed.

In Spain, carné is a normal and common spelling. You may also see carnet in some places, but carné is the standard adapted Spanish spelling.

Because carné is a masculine noun, so it takes el in the singular:

• el carné

Like many nouns, its gender just has to be learned with the word. There is not always a perfect rule.

Its plural is:

• los carnés

So:

• Tengo que renovar el carné.
• Tengo varios carnés.

The accent mark shows where the stress falls: car-NÉ.

Without the accent, Spanish spelling rules would suggest a different stress pattern. The written accent tells you clearly that the last syllable is stressed.

So it is pronounced approximately:

• car-NÉ

not

• CÁR-ne

The accent mark is important in writing.

The ñ is a separate letter in Spanish. It is pronounced like the ny sound in canyon.

So mañana is roughly:

• ma-NYA-na

More exactly, the stress is on the middle syllable:

• ma-ÑA-na

A few pronunciation notes for the whole sentence:

• mañana → ma-ÑA-na
• voy → sounds like boy with a softer Spanish b/v
• al ayuntamiento → a-l a-yun-ta-MIEN-to
• renovar → re-no-BAR in standard Spain pronunciation, with stress on the last syllable
• carné → car-NÉ

Yes, grammatically you can. It means something like Tomorrow I’m going to go to the town hall.

But in this sentence, voy al ayuntamiento is much more natural. Since voy already means I go / I’m going, adding a ir can sound unnecessarily heavy unless you want special emphasis.

Compare:

• Mañana voy al ayuntamiento. → natural, simple
• Mañana voy a ir al ayuntamiento. → possible, but more wordy

In everyday speech, the shorter version is usually preferred here.

No. That is a very common confusion.

In this sentence:

• voy al ayuntamiento

voy is simply the verb ir meaning I go / I’m going, followed by a + el → al, meaning to the.

So the structure is:

• voy + al ayuntamiento = I go to the town hall

The ir a + infinitive future structure would look like this:

• Voy a renovar el carné. = I’m going to renew the card/license.

In your sentence, the infinitive renovar comes after para, not after voy:

• voy al ayuntamiento para renovar el carné

So there are two separate parts:

1. voy al ayuntamiento = I’m going to the town hall
2. para renovar el carné = in order to renew the card/license

Normally, no. In this sentence, el is the natural article:

• renovar el carné

Spanish often uses the definite article where English may use my, the, or even no article, depending on context.

If you are talking about a specific document that both speaker and listener understand, el carné sounds right.

You might use a possessive in some contexts:

• renovar mi carné

But renovar el carné is very normal, especially when the document is understood from the situation.

The word order is flexible, but the original sentence is very natural.

Standard order:

• Mañana voy al ayuntamiento para renovar el carné.

Possible variations:

• Voy al ayuntamiento mañana para renovar el carné.
• Para renovar el carné, mañana voy al ayuntamiento.
• Mañana, para renovar el carné, voy al ayuntamiento.

These all work, but they shift the emphasis slightly.

The original sentence is probably the most neutral and natural everyday version.