Starts on Main Street, ends in Frontierland.
When I went in February - this was during a lower crowd time, and it had been raining, which delayed the parade a bit - I had a good spot at the "far end" of Liberty Square, just before you cross into Frontierland. I don't remember what time I started staking out my spot, but I think the Liberty Square/Frontierland area is generally less crowded than Main Street.