Hi Mom2brats - I have to agree with those who have said that the Holiday Inn Express on Buell Ave. is a good choice for an overnight stay. We were told we could park for up to 10 days for free (they said no problem when we told them we would actually need 11 days when we checked in) and the long term parking is right beside the normal hotel parking area. I had been afraid that the car would be off in a field somewhere, but that wasn't the case at all. The only drawback was that the adults heard the planes taking off until about 11:30 p.m. or so, but that wasn't too big an issue since the children both slept right through it.
Don't forget to ask them to give you a bagged breakfast for the next morning when you check in. They'll make note of it and have it waiting in a refrigerator for you.
We arrived at the airport (literally RIGHT across the road) at about 5:45 for our 7:30 a.m. flight. Southwest had curbside check-in, which was great, and we got our "A" boarding passes right there. The security line was surprisingly long - probably 30 minutes or so, and then we went right to our gate. We sat and ate our bagged breakfasts (bottled water, yogurt, banana, bagel and cream cheese) from the hotel. One good thing to note is that they use sturdy paper bags with good handles, so they're easy to carry.
We didn't bother getting into the "A" line until they announced boarding, so only had to stand like sheep for about 10 minutes. Even being at the end of the "A" line, we got 4 seats across row 13 or 14, and the back half or so of the plane was completely empty at that point.
I thought the leg room and seat room on Southwest (I think they generally use 737s) was much better than our previous trip using Air Transat.
We were very pleased with our Southwest Experience, and would do it again in a microsecond. The tickets for all 4 of us were $540 US (last November), which came out on VISA at about $700 CDN. At the time I booked, I wouldn't have been able to get a flight out of Toronto without spending an additional $1,000 or so, so it also made good sense from a financial standpoint.
Hope you have a wonderful trip!