<p>Please, please don’t stay in Newark, of all places! The only benefit of that would be making New Haven look nice!</p>
<p>This is the kind of thing my dad would do – he loves public transportation in general, and trains in particular. I once went on a trip with him where we tried to see how many modes of public transportation we could use in a day (train, subway, bus, ferry, cab – I think that was our best).</p>
<p>Anyway, all four colleges are very accessible by train. The trains can be the spiffy, fast Amtrak trains (or the even spiffier, faster Acela service, which probably does not stop at Princeton Junction), or the more pedestrian, slower, cheaper, commuter trains, which in the case of Princeton run twice an hour vs. once a day (supposedly – I do think it’s more than that, but I haven’t checked recent schedule changes). </p>
<p>Regardless of where you fly into, I would make NYC your home base. (Hey – it’s really exciting to be there.) You can take Metro North or Amtrak to New Haven, depending on how much time you want to take and how much you want to spend, but either way that’s a day trip. Take NJ Transit/Dinky to Princeton and back. Use Amtrak to travel between NYC and Philly – you’ll save 90 minutes each way, and avoid changing trains, but you’ll pay a bunch more. Or, if you want the real-world college student experience, take Bolt Bus or Megabus between NYC and Philly – much cheaper ($10), and about the same time as the cheaper commuter trains, and they go from and to the same places.</p>
<p>Penn is walking distance from the train station on a nice day, or a two-stop subway or trolley ride if it’s not nice. For Columbia, you take the 7th Ave. subway right to the campus. Princeton has the Dinky to get you from the real train station. In New Haven, you’ll want to take a cab for the mile-and-a-bit between the train station and campus.</p>