Coolant Leak?

Engine Cooling problem
1999 Pontiac Grand Am 4 cyl Automatic 126000 miles

I just drove across the country in this car about a week ago and every morning before hitting the road I checked all the fluids and I never had a problem. Everything appears to be fine. However, the other night I was driving home and about a mile from the house my low coolant light comes on. It was late and I was so close to home so I just watched the temperature gauge til' I got back to ensure it wasn't overheating on me. The gauge didn't move til' a stopped and put it in park. Then it started rising at a crazy rate so I shut it off fast. I could smell that burnt overheating smell and there was lots of steam and white smoke rolling out of the hood so it was obviously overheating. I let it cool down and checked the water levels. The reservoir was empty so I filled it up and started the car and watched for leaks. Coolant is obviously leaking out at a good rate but I can't quite tell where from. It isn't coming from anywhere near the radiator, nor the reservoir tank, nor the hoses going from the reservoir to the radiator, nor upper radiator hose, nor the lower radiator hose. However, I have pinned it down to a location but am not sure where it can be coming from. The lower radiator hose attaches to the coolant inlet pipe below the car's motor and the inlet pipe goes back up and connects to another pipe on the back right side of the motor (if you are standing in front of the car looking under the hood). This pipe appears to be of metal and then connects to another pipe that T's and goes into the motor on one side and somewhere else on the other side. It is around here that the leak appears to be coming from. But I can't get a hand or a good view on the area to see exactly where it would be faulty. So it is either a leak in a pipe in that area or it is leaking directly from that part of the motor. What do you think? What is the pipe(s) that the coolant inlet pipe connects to and does coolant actually enter the motor at this point? If my head is cracked or if I have a bad head gasket would coolant be leaking from this area of the motor? Note that there are no signs of oil in the coolant, nor coolant in the oil, nor milky residue on the oil cap, nor water drops coming from the exhaust (signs pointing to a bad head gasket) however, I haven't driven it since this has happened so maybe those sympotms haven't had time to show up yet? What do you think? Any advice would be greatly appreciated! Thank You!