"How much improvisation goes into your play?"
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One of the things that I like to do is make sure that I have items on me at all times that I can use to do a scene anywhere. The first thing I keep on my person is a knife. I guess it's pretty obvious that you can use it for knife play but I have also used a knife as the bit in an impromptu gag (please do not try that with your partner) and as a tool to cut off clothing. The second thing is a leather belt. The obvious use is as a paddle or slapper but you can also use it for bondage, collar and leash, breath play etc. The third thing that I keep on my person is a scarf and/or an extra-large handkerchief that I can use as a blind fold, bind their hands and feet or use as a gag. But I think the most important thing is if something were to go wrong these things could be used to stop bleeding or as a tourniquet. (I always like to mention this because accidents can happen and you always want to be prepared.)
On a side note I also keep granola bars and water in my car. Some people may think that this isn't actually being spontaneous but I say what do you expect from an Old Dom? I'm a control freak.