What gets you started?

[rudetreehill]

I don't have a trip planned right now, but on the way home tonight, I passed a tree with white twinkle-lights in it. The tree was outside a restaurant, and all of a sudden, I was thinking about how much I always love walking around the parks at night, looking at the lights... and suddenly, I'm thinking, "I need a trip." It's like a pavlovian response!

So what gets you started thinking "I need to start planning a trip?"