I go to Canada all of the time over the Buffalo/Fort Erie border, no worries! Assuming you're a US citizen and everyone you're with in the car is as well, just bring your driver's licence. No passport is needed for Americans
The deadline for that requirement keeps getting pushed back and hopefully it will never happen as it would be economically detrimental to both sides.
If you're really feeling paranoid though, then bring just your birth certificate or a passport if you have it, but just one form of government issues photo ID is all that's needed. And college issued student ID's don't count from what I've been told. Have a fun trip!!