higaeri no ryokou nara, kaeri no densya no zikan mo kakuninsite oita hou ga ii desu.

日帰り means going and coming back on the same day — in other words, a day trip.

So 日帰りの旅行 means a trip where you do not stay overnight. Even though 旅行 already means trip/travel, Japanese often uses both together naturally.

Here, の links 日帰り to 旅行.

You can think of it as turning 日帰り into a modifier:

• 日帰り = same-day return / day trip
• 日帰りの旅行 = a trip that is a day trip

This の is not only for possession. It often connects one noun to another, like X-type Y or Y of X.

なら means something like if it’s..., if we're talking about..., or in the case of....

So 日帰りの旅行なら means:

• if it’s a day trip
• when it comes to a day trip

Compared with some other conditionals, なら often sounds like it is picking up a situation already being discussed.

帰り is a noun meaning the return, the way back, or going home.

• 帰る = to return / to go home
• 帰り = return trip / way back

So 帰りの電車 means the train for the way back or the return train.

Japanese often uses this kind of noun form in expressions like:

• 行き = the way there / outbound
• 帰り = the way back / return

Japanese often chains nouns together with の.

Here is the structure:

• 帰り = return / way back
• 帰りの電車 = the train for the return trip
• 帰りの電車の時間 = the time of the return train

So the whole phrase means something like the time/schedule for the train back.

Neither の has to mean literal ownership. They are just linking nouns together.

も means also or too.

It suggests that checking the return train time is another thing you should do, not the only thing. The speaker may be implying something like:

• You’ll probably check other things already.
• You should also check the train back.

So 時間も確認して... gives the nuance of make sure to check that too.

確認する means to confirm or to check.

When you add ～ておく, it means doing something in advance, ahead of time, or as preparation.

So:

• 確認する = check / confirm
• 確認しておく = check in advance / make sure beforehand

This is a very common grammar pattern. It often implies: do it now so things will be easier later.

This is a very common point of confusion.

確認しておいた is the past form of 確認しておく, but in the pattern ～ておいたほうがいい, it does not mean the action already happened in the past in a normal time sense.

Instead, the whole pattern means:

• it would be better to have done it in advance
• more naturally in English: you should check it beforehand

So the past form here is part of the advice pattern, not simply a past-tense statement.

～ほうがいいです is a set pattern meaning it’s better to... or you should....

In this structure, ほう literally means side or option. So the idea is:

• the option of doing X is good/better

That is why が appears after ほう: it marks that option as the thing being judged.

So 確認しておいたほうがいいです means it would be better to check it beforehand.

Both can mean you should check it, but the nuance is different.

• 確認したほうがいい = you should check it
• 確認しておいたほうがいい = you should check it in advance / beforehand

The ～ておく part adds the idea of preparation.

So in this sentence, 確認しておいたほうがいい is especially natural because train times are something you check before the trip causes trouble.

Here, 電車の時間 does not usually mean the duration of the ride.

In this kind of context, it usually means:

• the train time
• the train schedule
• the departure time of the train

So 帰りの電車の時間 most naturally means the time for the train back, such as when it leaves.

Japanese often leaves out subjects when they are obvious from context.

In a sentence giving advice like this, the listener is understood automatically, so Japanese does not need to say you.

That is very normal. The sentence sounds natural without an explicit subject because the meaning is clear from the situation.

Yes. The overall sentence is polite because it ends with いいです.

Inside the sentence, parts like 確認しておいた are in plain form, but that is normal because they are inside a larger grammar pattern. Japanese often mixes plain forms inside a sentence that still ends politely.

So this is standard, natural polite speech.