I am interested in getting the JR Pass to travel within Japan. I will be starting in Narita. I was wondering if I get the 7 day JR pass, can I do the exchange when I arrive even though I won't be using the JR pass until Day 4 of my trip? In this case, should I make reservations already when I do the exchange?
In addition, because I won't be activating my JR Pass until day 4, should I get the Suica + N'ex package at the same JR office to obtain the round trip on N'ex? Does the Suica work in all the subways in cities like tokyo, yokohama, Osaka, and Kyoto?