..to build some jumps, have a few rails and form a little snow park. It doesnt really cost anything but would be bloody popular. If they put it under the lights at night with the music it would be a hit!
On a serious note tho, with Boro and Bansko competing, the one who grabs the freestyle scene first will do better. Generally people into freestyle are 16-30. These people have lots of disposable cash to spend.
As I said previously, you ca attract more people in a smaller area for less money building a snowpark than building more ski runs.
Daniel, dont worry about breaking your leg. Thats why you have two!