Narita 12-hour layover on January 1

I'm looking for suggestions or options for how to spend a 12-hour daytime layover (roughly 6:30am - 6:30pm, arriving to and departing from Narita) on January 1. How much time should we expect to have and what will be open on the holiday? Thanks so much for any help you can provide.

Public holiday. Almost everything is closed. And Tokyo is 90 minutes away. Just stay at the airport and rest.

Despite it being a major holiday, the things that will be closed are mainly places like museums/galleries and some smaller shops. Many restaurants and shops will still be open. For some shops/malls 1st Jan is one of the busiest days of the year.
With processing times at Narita and the trip into Tokyo you might consider just visiting the city of Narita (closer/cheaper). The temple is quite nice for a visit and depending what you are interested in there is a major mall out that direction too (with shuttle buses to/from the airport). Certainly enough time to get something delicious for lunch.

With a 6:30 a.m. arrival, not much will be open that early - so the temple visit might be a good idea. However, with first temple/shrine visits for the year, it could be busy.

Of course there is nearby Naritasan Temple, one of the very most popular temples for a New Year visit. Literally millions of people will be visiting the temple (about three million). It would be a special New Year experience.