[Miami/South Florida] I think what makes it good here (or anywhere for that matter) is that if you want to, you can create a community via education, relationships (working together), organizations, events, a festival, and networking amongst those in improv.
But to be more Miami/South Florida specific, I think what makes it good here is that despite some local improv people thinking that Miami/South Florida audiences won't or don't get it, longform, dramatic and experimental improv has been warmly embraced and is beginning to thrive. Obviously the weather in the winter is incredible, but what is really making the area great is the amount of talent that is coming into the market, in terms of improv actors and the subsequent growth of the groups.
Miami/South Florida becoming a good place to be if you can't get to Chicago/NY/LA; I think has a lot to do with a high profile festival, and a number of our local groups going out to do festivals. It has put us more on the map. Now, if we would only work together more, like some of the other communities, who knows where we could be?
Interesting question Jill. What say you?