Before you consider a "short" layover at either Narita or Tokyo, keep this in mind:
Narita Airport is located 60 kilometers from central Tokyo--a one-hour train ride. Therefore, allow at least three hours for the round trip for a short excursion into central Tokyo, and also check the schedule for your return trip in advance.
For an excursion to visit the Naritasan in Narita City, allow at least three hours.
The Tourist Information Desk will be helpful in giving you advice and brochures as to sightseeing & special events, as well as helping you with your choice of accommodations. Location:
TERMINAL 1 - Central Bldg, 1st Floor (Arrivals); open 8am-8pm; Tel: +81(0)476-30-3383.
TERMINAL 2 - Main Bldg., 1st Floor (Arrivals); open 8am-8pm; Tel: +81 (0)476-34-5877