A track? Do it before you get 6th gear in and a fuel economy gauge installed, that way you have more of an excuse to let loose in it once or twice. Plus, if you start out with lower mileage, your LMPG can only go up from there, rather than later down the road when your LMPG is high and a track day would hurt your hard-earned lifetime average.
Okay, I'll stop trying to be a bad influence now.