For a good (yet cheap) time in L.A., do the following:
Get dressed in business attire, grab a clipboard and pen and start visiting county ERs. Once there, pretend like you're doing a head count.
LOL! Or you could walk the streets with a cap or shirt labeled INS. Kind of like watching the parting of the Red Sea.
lol
Park in a Home Depot (or similar gathering spot) parking lot early on Saturday morning. Take out your clipboard and your digital camera. Make sure the flash is on, even though it's daytime, just to draw attention.
Take a couple of pictures...write a few things down. Make sure you're seen. It's amazing how fast that crowd dissipates.
hehehe. guerilla warfare with no collateral damage. I love it.