Over the long run for me, it's "$activity with friends"

Building that mobile app - with friends.

Flying quadcopters - with friends.

Building robots - with friends.

Riding motorcycles - with friends.

Seeing live music - with friends.

Sitting round a fire on a beach - with friends.

Cheering at roller derby matches - with friends.

Sitting in a park reading - with friends (OK, there's only one friend I do this with mostly...)

They're different groups of friends (and reading over what I just wrote, some interesting intersections of groups of friends that I should probably pay more attention to).