Working remotely in the summer (MSc) I'm considering moving back in with my parents over the summer to save money on rent. I would still be able to commute to campus at least once a week (4 hours each way, but I can nap on the ferry ride) to meet with my advisor. I'm working on my masters in math and I don't have any obligations in the summer that would require me to be on campus physically.

I asked my advisor and he said he is fine with this, but I am hesitant. On one hand, I would be able to save a good amount of money; on the other hand, I am unsure if this is a wise idea.

I'm curious to know your insights are on this. Thank you for any input!

Edit: I hadn't thought about some of the things you guys brought up and I really appreciate all the input! I have made up my mind and decided to move for the summer.
I don't understand why this is an issue. You can do mathematics anywhere. The same is true of other fields as well, though maybe not all. All you need is your mind and possibly a bit of paper to write on. You can use a commute to develop ideas, or to rest your mind. 

There is nothing, really, in the air near a university that makes thinking easier, though interaction with other people usually helps. 

But, as a newcomer, assuming that is your position, you need feedback on your ideas. That can be done remotely, nowadays, though your proposed occasional meet ups will also be beneficial, provided you use them for that feedback. 

Being seen has little value in mathematical development. Producing something worth reading will be more valuable in your career than just "being seen". If your advisor agrees, you can share your work at any time via the internet or email. 

Note that some researchers carry on collaboration remotely for years, not just a few months.