Sawara has a traditional atmosphere, near Narita. (but need more than 30 minutes on one way)
However, stores may be shut down at night, so what you see from the evening may be limited.
Narita is famous for eel. If you do not eat eels elsewhere, I think that it is good to eat.
Narita's mascot is Unari. That meaning is Unagi(eel) + Narita.
Or buying a souvenir.