Svratićemo na vidikovac.

Because this is a Serbian future-tense form.

The verb is svratiti and the future auxiliary for we is ćemo. In Serbian, when the auxiliary comes after the verb, it often attaches to it:

• mi ćemo svratiti
• svratićemo

Both mean the same thing. In this sentence, the attached form is used, so it appears as one word.

-ćemo marks we will.

It comes from the auxiliary verb hteti in its future-tense clitic form:

• ću = I will
• ćeš = you will
• će = he/she/it will
• ćemo = we will
• ćete = you will
• će = they will

So svratićemo literally contains the idea we will stop by.

Because Serbian usually does not need subject pronouns when the verb form already makes the subject clear.

Here, -ćemo already tells you the subject is we, so mi is unnecessary.

You could say:

• Mi ćemo svratiti na vidikovac.

But that would usually add emphasis, contrast, or clarity. The shorter sentence is more natural in many contexts.

Svratiti usually means something like:

• to stop by
• to drop in
• to make a quick stop
• to make a brief detour

So the sentence does not usually suggest a long visit. It sounds more like we’ll stop off at the viewpoint than we’ll spend a long time there.

Because svratiti is the perfective verb, and that fits this sentence well.

In Serbian:

• svratiti = one completed stop / a single occasion
• svraćati = repeated, habitual, or ongoing stopping by

Here the speaker is talking about one future action, so svratiti is the natural choice.

Using the imperfective would suggest something more like a repeated habit or a more open-ended action, which does not fit as well here.

Because Serbian uses na with certain destinations that are thought of as open places, surfaces, elevated spots, or public locations.

A vidikovac is a viewpoint / lookout / scenic overlook, so it is normally treated as a place you go onto / to rather than into.

That is why na vidikovac is idiomatic.

Very roughly:

• u is often used for going into something
• na is often used for going to/onto certain kinds of places

With vidikovac, na is the normal choice.

It is accusative singular, because na with movement toward a destination takes the accusative.

So:

• na vidikovac = to the viewpoint

A useful contrast is:

• na vidikovac = motion toward it
• na vidikovcu = location at it

Because vidikovac is a masculine inanimate noun.

For masculine inanimate nouns in Serbian, the accusative singular is usually the same as the nominative singular.

So:

• nominative: vidikovac
• accusative: vidikovac

That is why the form looks unchanged even though the case is different.

Then Serbian would normally use na vidikovcu, which is the locative form after na for location.

For example:

• Bićemo na vidikovcu. = We will be at the viewpoint.

In your sentence, though, the idea is a stop to that place, so na vidikovac is the right form.

Yes, absolutely.

That version is also correct and very natural. It just uses the future in the split form:

• Mi ćemo svratiti na vidikovac.

Your original sentence:

• Svratićemo na vidikovac.

is a bit more compact. The meaning is the same. Adding mi mainly gives emphasis to we.

Roughly as:

svra-ti-će-mo

A few useful pronunciation notes:

• The beginning svr- is pronounced without adding an extra vowel.
• ć is a soft consonant, softer than č.
• The letter č is harder, while ć is more palatal.

So an English speaker often needs to pay special attention to:

• the consonant cluster svr-
• the soft sound ć in -će-