definetly carry mics, but if you do, bring headphones as well, even if they are just from your iPod, to monitor the audio input. i've edited a multi-angle film before now where a LOT of the audio was missing due to faulty microphone sockets. not great. so always check!!
it's important for the camera operator to communicate with the sound technician whilst filming as well - worthwhile if you don't want a furry grey thing in your shot.
(: