Airnav lists 4N1's runway as 3470x60 asphalt, good condition. This is

more than suitable for light GA ops. I have never been to 4N1, but
find these comments from former Mayor interesting.

When I was taking flight lessons in Sussex, the second or third day I
said to my instructor, "Thank goodness we're not flying from Greenwood
Lake, because I've heard it's got lots of wind shear." He, of course,
made me fly there right away to dispell my fear. My first solo flight
out of my home airport was to there, too.

But yes, it can be tricky at times, good practice really.
Unfortunately they built a nursing home right off one runway, leaving
pilots in trouble no option but to crash into the woods, or off a
cliff, or into a lake. I think that's why the landing displacement
grew, too. But I'm sure others will have better info.

The CFI lived just down the street from us. My wife and 2-year old
daughter had just seen him that morning, and he (a really nice guy) had
come out to wave to them. Very sad.