I'm considering starting a neighborhood-wide wardrive, with the objective of raising awareness to the risks of running unsecured wireless networks.

Right now, I'm still in the planning stages of this project. The plan so far entails:

* Loading up a laptop and vehicle with appropriate tools.
* Drive through the entire area, to get a general map of wireless network coverage, and gather general statistics about the use (or non-use) of wifi security in the area.
* Use gathered statistics to garner support from the local community organization, for further wardriving activities.
* Use direction-finding antennae where appropriate, to identify buildings with unsecured or less-secure wireless networks.
* Alert owners of vulnerable networks via personal visit, flyer on the front door, letter in the mail, or phone call.
* Offer a free or low-cost consultation visit, to help the owner secure their network appropriately.

Currently, I do not run my own personal IT business. So, I'm more looking to do this as a service to the community - a "Neighborhood WiFi Watch" as I'd like to call it.

I'd like to do this in a way that is ethical, legal, and of course well-received in the local community. To this end, what laws, best practices, and other policies should I be mindful of when planning or executing this?

While answers addressing any region of the world are welcome, my particular project is in Florida.