Will,
Best of luck with the application. I'll be the BU advocate here since it was three of the most fun years of my life. I don't know much about RPI, other than the fact that northern new york has nothing on boston. At BU you will be in a city with 250,000 other college students (good odds even for the engineers), live within 10 mins of fenway park and hundreds of bars, and be able to cheer on a national champion hockey team. They just built sky-rise, high quality dorms, and a 25$ mil facility including a new hockey stadium and state of the art gym (has a track on the second floor, rock climbing wall, olympic size pool, smoothie bar, and lazy river). Yes, BU has a LAZY RIVER.
I was there in 2004 when the Sox came back from a 3-0 deficit to beat the Yankees in the ALCS. Kenmore square erupted. Cars were flipped, signs were torn down, and cops rolled in with tear gas. On the march back to BU, the crowd was led by a guy playing some irish tunes on the bagpipes. Quite the experience.
I majored in history, did rotc, and ran track. Rarely studied, drank all the time, sucked at running, and had an absolute blast. My buddy was an aerospace engineer, studied all the time, rarely slept, built a satellite ... and now we're both naval aviators. Whatever you want to do, go for it, and don't let anyone tell you that you can't.