<p>Boston can be reasonable (certainly cheaper than NYC), but Harvard Square is expensive… perhaps at NYC levels.</p>
<p>Keep in mind that, as a Harvard student, you could easily go a week without spending a dime, because all of your food, housing, etc is paid for.</p>
<p>To answer some of your more specific questions:
Taxi costs: $35-$40 to the airport (take the subway instead for $1.70). Around $20 to downtown Boston (again, take the subway for $1.70, but it closes around 12:30 a.m.)</p>
<p>Museum fares: I don’t think I paid for a museum in my four years. Your Harvard ID gives you free access to all of Harvard’s excellent museums, as well as the MFA downtown.</p>
<p>restaurants: Lots of places to get a late night burrito or slices of pizza for ~$5. Good mix of cheap eats (~$10 Thai places) and pricier places (~$50+ at Upstairs On the Square) in Harvard Square.</p>
<p>grocery prices: Harvard Square has no true grocery store. The options within a short walk (Broadway Market, CVS, Market in the Square) are pretty horribly overpriced… but most students do little grocery shopping, so it’s not a big deal.</p>
<p>hotels (for friends): Hotels in Harvard square are absurdly priced (especially during any parent visiting days). I recommend using “name your own price” on Priceline.com. You can usually get a great hotel (one of the Boston Hyatts or similar quality) for ~$100/night.</p>
<p>car rental: Impossible until you turn 21, I believe. After that, you can get a ZipCar membership and pay ~$8/hr or ~$70/day for a car.</p>
<p>Alcohol: Ridiculously expensive. Get a friend with a car to go to New Hampshire and stock up for you. There aren’t any cheap bars (beer < $3/pint) in Harvard Square, at least not that I found.</p>