Are you a planner or an improvisor?

Some people seem to like to have their weekends, etc, filled withstuff they know will happen. I find pleasure in getting off work on Friday and have no idea where I will be from moment to moment. This requires me to be on my own a bit more than most, I think, but usually worth it. I also like being called out by desperate planners looking for a companion on their excursions. Those are also unpredictable and usually fun times. Where do you fall?