Without bonus points: climbing. It’s always done in groups, the community is very open and you spend a lot of time just talking.

Basically you show up to a local climbing gym, try a boulder, some guy tries it after you, you say something like “I think you need to switch hands here”, you start chatting, ask him about outdoor climbing in the area, he says that he’s going to a nice stop this weekend, invites you to join, you go and hang out with people all day. It really is that simple.