It is exactly 4 weeks before I leave for the USA, and most of the preparations are complete. The hardest task has been to work out a route that would take me to all the places I wished to visit and determine the start and finish times for the tour. That done, my Atlantic flights and accommodation in New York have been booked. Now it's time to make sure I have all the gear I need to take, bearing in mind that it all has to fit in a rucksack.