Nathan
Google
Visited 7/25 on a weekday.
Definitely the highlight of Tanegashima. We booked the 10:15 tour of the facility, which included the Rocket Garage, Launch Complex, and Control Room. Each location is an absolute engineering marvel to look at, and the transport buses were quite comfortable.
Also, you aren't allowed to take pictures or videos of the Launch Complex or the Control Room for obvious reasons.
We were handed English translated paper guides which made the tour easy to follow as well.