Something different and possibly unique / whimsical.

A lot of train stations have a rubber stamp + ink pad of the station name and a logo / picture. As you trvel around Tokyo via their excellent public transport system, look around or ask their staff where the “ike-stamp” is.

It became a very unique souvenir of my holiday there.

Also along the same line, most shrines you visit will have an office where you can purchase a “shrine book” and for a few hundred yen, have a staff write in it the name of the shrine and the date you were there. Another unique souvenir.

Get to da choppa.

Wing Commander series. Played a lot of Wing Commander 1 to 5 as well as the spinoff Privateer.

I also spent a good amount of time playing Civilization 1.