My kids were in a parish youth group for a while and their favorite things to do were the outings. They'd go bowling as a group and I remember everybody wanted to participate when they went to "Zoolights" -- one of those holiday light things... at the zoo.
Most of the kids found that helping at the "soup kitchen" of the nearby big town was an eye-opener and something they felt very good about. They also liked caroling within the small town where we live. That was a once a month activity and very popular... also something that each one felt was important to put on their senior resumes.
Frankly, just going to church to play ball wasn't much of a draw. They needed to feel like what they were doing was a little bit different and more meaningful (of course... I have NO IDEA what kind of meaning they got from bowling!
).
They also liked planning and helping with activities for the younger kids.