Thanks. While the development made possible by I-78 is slowly ruining parts of Hunterdon and Warren Counties, they are still great places to ride. I lead several club rides up that way every year and have done a Port Jervis-Philly tour the last two years. Hunterdon County usually makes the list of America's wealthiest counties as measured by median household income. A few years back it was No. 4 two years in a row.
If you are looking for a nice one-day event, check out the Black Bear Century, which starts in Delaware Water Gap, PA but is mostly in Sussex County, NJ. One route takes you up to High Point State Park, which, as its name suggests, is the highest point in NJ. There is usually at least one black bear sighting every year. Sort of a haul from Brooklyn, but there is a nice Day's Inn with a heated indoor pool on U.S. 209 in E. Stroudsburg. PA. The hotel is close enough that you can ride to the start of the event. The only caveat is the weather. The ride is in October so it can be very cold, at least in the morning. Last year it was around freezing when we set out from the hotel to the start.