Wow, nothing I could add would be appropriate.
I am visiting our nation's capital next week, Canberra, with 170 Year 10 students. Now, these things can be a bit tricky, so what should I take with me to ensure my survival?
May be a taser? A cosmic box? A St. Bernard loaded with booze?
A stool or chair easily wieldable in one hand, a whip or switch to keep them at bay, and a gun to put them down if they get too rowdy.
Alternatively, if you're not an aggressive type:
(Hang on...insanity, I don't think I've completely thought through that one)
I recommend several good maps of the area you'll be in (out to a couple blocks beyond where you expect to be, in case of navigationally-challenged issues). I also recommend a phaser set to stun, so if they drive you nuts you can use it on yourself :p Ankle bracelets with GPS so you can find your lost kids wouldn't hurt either :) The other reason to have the maps is to plan your escape route in advance!