You may soon be able to purchase a mobile Wi-Fi unit for your car, or rent Wi-Fi from Avis when you rent your next car: http://www.playfuls.com/
news_05676_Drivers_Can_Now_Go_Surfing_With_New_Internet_Service.html. Since more than one user can access the Wi-Fi within a 30 meter area, your next outreach training class could take place under the trees and sky, instead of a computer training room.