Congrats
Congratulations!!!
Its better to be on WEDNESDAY. Please take your approval notice,Passport,EAD and 2 Photographs.
If you want you can take all other additional documents like paystub,W-2 , tax return,bank statement etc. But they wont be asking you just to be on safe side.
You will find a Paid parking lot ($8 per day) next to the INS office.
Good Luck!!!
~Mad