this only works if you actually end up enjoying the activity, but everything from arts classes to beginners rock climbing clubs or a running club can work.

For me I joined a silly learn-self-defence club when I first moved to the big city and I can't now remember any moves but I have fond memories of some of the people.

There are no promises of budding or lasting friendships forming, but its always worth a shot and you might actually find something that sticks.