I'll be traveling to Vietnam in three weeks and I've got a substantial layover in Tokyo on the return, from 7:20AM-5:45PM, would anyone think that gives me enough time to take a railway or other transport into the city to visit for the day? I don't speak any Japanese either, so if anyone has a recommendation for accessible places to see, bikeshops would we great and some food to load up before an 18 hour flight, I'd be very appreciative. If anyone has a spare sanrensho and wants to grab some beer and rolls, i'm down!