I can be spontaneous but usually I plan something. Especially when it comes to big vacations, I always have to look at what's available and then look at it a second and a third time to make sure it's something I want to do. I planned everything down to the letter for my UK trip this summer. Every day will be full so I get the most out of my two weeks.
I also plan when I'm driving someplace new, I always check at least three routes to the location and I write down all three.
I'm spontaneous when I'm shopping, I can go to a store for one thing and come out with five things.