This Is a response to MRFarts Inspire Me Contest, I recommend you go check it out and submit your own entry, theres a 500 point prize and its an opportunity to share something great you've done!
I think one of the best things i've ever participated in was in 2010, I was a part of a missions trip to Bethel Baptist Church in Kansas City, Kansas. Bethel is a church in an unfortunate part of the city, and during the summer provides a refuge during the day for children to come, eat lunch, play games, and learn about the Bible. My youth group and I had just had Vacation Bible School at our own church, themed around the ocean. We had entire sets, and plays, and a cirriculum, our church really benefited from it. So when our group was asked to pack up and put up the same Vacation Bible School 8 hours away in Kansas, we were thrilled, although a little scared. Most of the children didn't speak English as a first language, being Burmese, Spanish, Balinese, and everything else under the rainbow. That's quite a language barrier. But nonetheless we packed up the entire set in the back of our church bus and headed out, excited for this opportunity.
This ended up being one of the most rewarding experiences of my life, and I think the children taught us more about how to live humbly and simply than we taught them about almost anything. We spent a week with the children, working with every single one to teach the message we came to teach, and hoping we made their lives a little more fun, if only for a short time. In the very end as we left, we left them with the Vacation Bible School set so the church would be able to provide that for the kids every year. I hope we made an impact on all those kids, because they sure made an impact on me.