Hi there,
If you want to drive a Lambo or Ferrari in a track, you can get a hold of these guys and see if there is an upcoming track day that matches your trip:
http://www.miamiexoticautoracing.com...erience-events
I don't know any BMW part stores in Miami but you can get some things from these websites and have them expedite the shipping so you get it on time:
http://www.hpashop.com/1M_c246.htm
http://www.getbmwparts.com
Good luck!!
diego