I would say playing pokemon. I spent countless hours with friend and family battling and trading through out the generations. One would be ny parents took my brother, best friend, and I to a Pokemon Black & White promo pre-release demo release in a mall a few hours away.
The mall had a few pokemon inflatables scattered around the mall (like Zekrom and Reshiram) and an area with DS to play for X anount of minutes. We waited in line (the mall was fairly empty due to a bad snow storm heading in the area) for a short time and got to play.
I was excited due to the new seasonal changes (which was unique mechanic) and battles. I took a couple of photos (with my sliding pre smartphone and got a pin of one of tje flagship pokemon.
I do wish I had my old phone because my parents took a photo of my friend, my brother, and I standing in front of one of the inflatables.
After losing my brother to suicide last year and unable to stay in contact with my long time best friend due to reasons, I cherish going to expos and gaming events.
Looking back now just shows how video games have a huge impact growing up for everyone.
Awesome post OP and romhacks are fun to play. I played a lot of pokemon romhacks and I feel gamers now don't have that experience we had.