raisyuu no ryokou no koto wo kangaeru to, ima kara wakuwakusimasu.

They are doing two different jobs:

• 来週の旅行 = next week’s trip / the trip next week
  Here, の links 来週 to 旅行.

• 旅行のこと = the matter of the trip / more naturally, the trip as something being thought about
  Here, のこと turns 旅行 into the thing/topic about the trip.

So the whole chunk 来週の旅行のこと means the matter of the trip next week, which in natural English is just the trip next week or next week’s trip.

〜のことを考える is a very common pattern meaning:

• to think about ~
• to have ~ on one’s mind

So:

• 旅行のことを考える = think about the trip

If you say 旅行を考える, it is less natural in this context. It can sound more like:

• thinking up a trip
• planning a trip
• considering the idea of a trip

By contrast, 旅行のことを考える clearly means thinking about the trip in a broad, natural way.

In this sentence, こと works like the matter of or the thing about.

So:

• 旅行 = trip
• 旅行のこと = the matter of the trip / about the trip

This is a very common structure in Japanese. It often adds the sense of someone/something as a topic in your mind.

Examples:

• 将来のことを考える = think about the future
• 仕事のことを話す = talk about work
• 彼のことをよく知っている = know a lot about him

So here, こと is not really something you translate literally every time. It is part of a natural expression.

No. This と is not the quotation particle or the and-like particle.

Here, と connects clauses and means something like:

• when
• whenever
• if

So:

• 考えると、今からわくわくします = When I think about it, I get excited already = Thinking about it makes me excited already

This と often expresses a natural result:

• 春になると暖かくなる = When spring comes, it gets warm
• その歌を聞くと元気になる = When I hear that song, I feel better

In this sentence, the result is emotional: thinking about the trip leads to excitement.

All of those can connect ideas, but the nuance changes.

• 考えると
  sounds like a natural, automatic result
  When I think about it, I get excited

• 考えたら
  often feels a bit more like when I think about it in a situational or personal sense
  also very natural here

• 考えて
  means think about it and then...
  this sounds more like a sequence of actions than a cause/result relationship

So 考えると is a good choice because it emphasizes that thinking about the trip naturally causes the excitement.

Because with this conditional/result と, Japanese normally uses the plain non-past form before it:

• 行くと
• 見ると
• 考えると

This does not necessarily mean future tense. It is just the standard grammatical form for this pattern.

So 考えると means when I think about it or whenever I think about it, not when I will think about it.

今から literally means from now or starting now, but in this sentence it has the nuance of:

• already now
• even now, ahead of time
• this far in advance

So:

• 今からわくわくします = I’m excited already = I’m getting excited already, even now

It highlights that the trip is still in the future, but the speaker’s excitement has already started.

わくわく is an onomatopoeic/mimetic expression that describes a feeling of excited anticipation.

With する, it becomes a verb-like expression:

• わくわくする = to feel excited / thrilled

So:

• わくわくします = I feel excited

It is often used for happy anticipation, not nervous tension. For example:

• 旅行の前はわくわくする = I get excited before trips
• 新しいゲームにわくわくしている = I’m excited about the new game

Both are possible, but the nuance is a little different.

• わくわくします
  expresses I get excited / I feel excited
• わくわくしています
  emphasizes the ongoing state: I am excited

In this sentence, わくわくします sounds very natural because it describes the speaker’s emotional reaction whenever they think about the trip.

If you said:

• 来週の旅行のことを考えると、今からわくわくしています

that would also be understandable, but it puts more focus on the speaker’s current ongoing state.

The subject is understood from context as I.

Japanese often omits subjects when they are obvious. So this sentence naturally implies:

• 私は / 僕は / 私は 来週の旅行のことを考えると、今からわくわくします。

But adding the subject is usually unnecessary unless you want contrast or emphasis.

This is very normal Japanese. English requires I, but Japanese often leaves it out.

You could translate it that way word-for-word, but it is not natural English.

A better natural translation would be:

• Thinking about next week’s trip already makes me excited.
• When I think about next week’s trip, I get excited already.
• I’m already excited when I think about next week’s trip.

This is a good example of why Japanese is often best understood by structure + nuance, not by matching each word mechanically.

It is mainly there to make the sentence easier to read.

• 考えると、今からわくわくします。

The comma marks a pause after the first clause. It is helpful, especially because 〜と sets up a result in the second clause.

Japanese punctuation is somewhat flexible, so the sentence could be written without the comma, but the comma is natural and makes it clearer.