To answer the question, drain it into a container.  The following is
plagiarized from the Prestone website:

"Dispose of the used antifreeze/coolant according to local laws and
regulations. Be sure to label the disposed container clearly as used
antifreeze. Some accidents happen because the container was mistaken for
something else. So don't use containers from beverages to store used
antifreeze. Keep the container stored securely away from children and
animals until you can dispose of or recycle the used coolant safely. "

Here in NJ we can take it to our county recycle centres, as long as it is
not mixed with oil, and turn it in for recycling.  There is a limit, I
forget what it is, but if you show them documentation of your cooling system
capacity (IE owner's manual or Bentley), they will allow you to dispose up
to that amount.  At least here in Ocean County, NJ they do.

Believe it or not, some localities (none here in NJ however) allow it to be
dumped in sanitary (not storm) drains.  I am not comfortable with this, but
they say it is biodegradable, especially if you have a septic system.  The
governments say it is okay so.....
....but then again, they also believed at one time that plutonium could be
kept in steel barrels underground.  Hmmmm

Tim Crooks
90 Vanagon GL
Barnegat, NJ