Firearm or a plastic lightsaber, either will work. Muggers tend to stay away from the crazy looking tourists. Seriously, most places downtown are pretty safe. Exercise a little common sense and you shouldn't have anything to worry about. Everything is within a couple of blocks from the convention center (hotels, resturants, brothels, and crack houses, etc. etc.) and are in well lit areas. It's always smart to go with a group, see the common sense statement above, which with thousands of fans making their way to the city shouldn't be a problem. Feel free to name me in your will though, just in case.