Join Date: Dec 2004
Location: Riding the rails
Programs: Japan Forum, Skyteam Elite Plus, BW Diamond Select, HHonors Gold, NWA, DL, NH
Posts: 1,936
You shouldn't have a problem, they'll stamp you with a 90 day temporary visitor's permit.
As for the signs, on the trains, train stations etc, it's virtually all Japanese/English(Romaji) signage at the stations.