The same things they do now, just with no social media.
People watched a lot of television and movies - set their days up around their favorite shows.
If you're young, you hang out at the park, the *mall* especially, go to the movies, go to local bars and clubs, hang-out on campus, ride your bike everywhere, or chill at home.
Video games were still pretty big, there were still arcades but if you didn't have LAN you'd go over the homie's house and play video games.
Not much has changed in terms of outings tbh