Here are some links that provide plenty of information about the Obama campaign and community networking.
To find local offices, type in the name of the state you're going to, then a dot ".", then "barackobama.com". (for example http://OHIO.barackobama.com). Then click on Find Your Local Office - you'll get a map with the location of all the Obama offices in the state.
Another very simple way to make sure you know where to go when you get to your destination is to search events in the area. Just go to http://my.barackobama.com/page/event/search_simple and enter the zipcode of the city where you will be staying, and you will see a list of events for voter registration, door-to-door canvassing,etc.
