It's not in Aventura, it's deep in Miami on US 1 past UMiami. So even further for you, I'm used to the drive so it isn't that bad. After hearing that about it only being reserved for 15 mins, I'm sure I can get there early enough to get myself a spot.
Also, apparently the MSFT Store opening is tomorrow at 11am. There is a line up happening now near Macy's- people who camp out will get giveaways and the doorbusters are a Dell tab for $99 or a Surface Pro 2 for $199. If I didn't work, I'd be there right now for the surface.