aki no kyouto ha kankoukyaku ga ooi ue ni, eki no mawari mo kanari komimasu.

Literally, 秋の京都 means Kyoto of autumn or more naturally Kyoto in autumn.

The particle の connects nouns and lets one noun describe another. Here, 秋 modifies 京都, so the idea is Kyoto during the autumn season.

This kind of noun + の + noun pattern is very common in Japanese:

• 日本の文化 = Japanese culture
• 春の東京 = Tokyo in spring
• 駅の周り = the area around the station

So 秋の京都は sets up Kyoto in autumn as the topic.

は marks the topic of the sentence.

So 秋の京都は means something like:

• As for Kyoto in autumn, ...
• Speaking of Kyoto in autumn, ...

The rest of the sentence then tells you something about that topic:

• it has many tourists
• and the area around the station is also quite crowded

This use of は is very common when the speaker wants to describe or comment on something generally.

In X が 多い, the thing before が is what exists in large numbers.

So:

• 観光客が多い = there are many tourists

This is the normal pattern with 多い:

• 人が多い = there are many people
• 車が多い = there are many cars
• 店が多い = there are many shops

Using 観光客は多い is not impossible, but it sounds more contrastive, as if you mean:

• Tourists are numerous, at least
• or As for tourists, there are many

In a neutral statement like this, 観光客が多い is the natural choice.

In natural English, it means there are many tourists.

Japanese often uses X が多い where English would use there are many X. So even though the literal structure looks like tourists are many, the natural meaning is existential:

• 観光客が多い = there are many tourists

This is a very common pattern, and it is best learned as a set expression.

うえに means on top of that, in addition, or moreover.

It connects one point to another, usually adding information in the same direction. In this sentence, both parts are negative from the traveler’s point of view:

• there are many tourists
• the area around the station is also quite crowded

So うえに adds the second problem to the first:

• There are many tourists, and on top of that, the area around the station is also quite crowded.

It often has a slightly written or formal feel compared with something simple like そして.

All three can connect ideas, but the nuance is different.

• そして = and, and then
  Very general connector. It just links statements.

• それに = besides, moreover
  Adds another point, often in conversation.

• うえに = on top of that, in addition
  Strongly emphasizes that one thing is added to another, often with the sense of piling on.

In this sentence, うえに works well because the speaker is stacking two related facts:

1. Kyoto in autumn has many tourists.
2. On top of that, the station area gets crowded too.

So うえに sounds more deliberate than just そして.

This is normal in Japanese.

Before connectors like うえに, verbs and adjectives usually appear in their plain form:

• 観光客が多い うえに
• 安い うえに
• 便利な うえに

Then the whole sentence can still end politely:

• 観光客が多いうえに、駅の周りもかなり混みます。

So this is not a mismatch. It is just how Japanese grammar works:

• internal clauses often use plain form
• the final sentence ending shows the politeness level

駅の周り means the area around the station.

Breakdown:

• 駅 = station
• の = linking particle
• 周り = surroundings, around, area nearby

So 駅の周り is not just the station building itself. It means the vicinity around it, such as:

• nearby streets
• station plaza
• surrounding shops and walkways

も means also or too.

The speaker has already said one thing:

• 観光客が多い = there are many tourists

Then they add another related point:

• 駅の周りもかなり混みます = the area around the station also gets quite crowded

The も helps show that this is an additional point. It gives the feeling of:

• not only are there many tourists, but the station area is crowded too

So も fits very naturally with うえに.

かなり means considerably, fairly, or quite.

It often suggests a noticeable degree, but not always as strong or emotional as very.

So:

• かなり混みます = it gets quite crowded / fairly crowded / pretty crowded

Compared with some other adverbs:

• とても混みます = very crowded
• かなり混みます = quite crowded, considerably crowded
• 少し混みます = a little crowded

In this sentence, かなり sounds natural and descriptive.

Both can be possible, but they are slightly different.

• 混みます focuses on what happens or what tends to happen
  = it gets crowded / it is crowded
• 混んでいます focuses more on the resulting state
  = it is crowded / it is in a crowded condition

In a general statement about Kyoto in autumn, 混みます is very natural because it describes a typical situation:

• In autumn, the station area gets quite crowded.

If you were describing what you see right now, 混んでいます might be more likely:

• 駅の周りは今、混んでいます。 = The area around the station is crowded now.

Yes, 京都の秋は is also possible, but the focus shifts a little.

• 秋の京都は = Kyoto in autumn
• 京都の秋は = autumn in Kyoto / Kyoto’s autumn

Both can often be translated similarly, but the nuance is different:

• 秋の京都は treats Kyoto in autumn as one scene or setting.
• 京都の秋は highlights autumn as it is in Kyoto, almost as a seasonal feature of Kyoto.

In this sentence, 秋の京都は sounds very natural because the speaker is talking about what Kyoto is like during autumn.

It sounds like a general statement about a usual situation.

Because the sentence uses forms like:

• 観光客が多い
• 混みます

it sounds like:

• Kyoto in autumn tends to have many tourists, and the area around the station also gets quite crowded.

If the speaker wanted to talk about one specific day or one specific trip, they might add words such as:

• 今日は
• 今
• この時期は
• 先週

As it stands, the sentence sounds like a general observation about autumn in Kyoto.