Thank you both for your advice. It's not the distance I'm worried about, but doing that distance on a hybrid. I mean, the bike is just so heavy! I think I'm going to get my hybrid tuned up (it's been in the basement since last fall), maybe even get a new seat for it and try to switch the pedals from platform to my clipless (that will be an adventure).
I guess I'll go for a few rides on the hybrid before the NYC ride so it's not a shock to my system going back to an upright position.
It's only worth it if you're having fun