Google Maps, Printer & lots of Scotch Tape!
Or buy a local street directory & lots of Scotch Tape. The cheapest solution and one that I have used before when planning out cycling journeys around the island.
Or Google Earth and a very very large screen or a video wall.....
There are Map places online that will sell you rather large ones but just how big do you need?
http://www.mapsworldwide.com/sku_34981.htm
The biggest I could find:
URL CENSORED DUE TO COPYRIGHT ISSUES
also bloody expensive!
sms