lovensing:
Don't worry, I was told by Newark office that they issue walkin AP's and whatever the reason, I was given one last month as I had pending AP for 90 days, did not pay fee as he just attached the copy of the receipt notice, the officer clearly told me that I should not have wasted my time by sending applic to VSC, it seems Newark has a liberal policy for the AP.
This is what you need to do:
Take:
One application filled
If you don't have one pendign applic then certified check or money order for the fee they don't accept personal check
2 photographs
copy of I485
if you have ticket or itenarary take that too sometime they ask for that too, however I was not asked for that.
As for me I told them clearly that I am going for vacation, if you have some other reason tell them that.
There was one other person beside me who got AP for NO EMERGENCY, they issued me AP for 1 year for multiple, just came back 2 weeks back from India.
Don't worry, you will have to spend 4-5 hrs, but when you think of the benefit of meeting your family etc it is 100% worth it.