Just got back from Vegas. Please, if you haven't already gone on one, go to The Great News Network and sign up for an Evangelism Boot Camp. This thing is powerful. It is the closest I think we will get to the first century church. Hundreds of believers, no doctrinal divisions, all out taking their faith to the streets and reaching out for the lost. You will come back changed. It is not a retreat, in fact, they call it going on the advance. If you have any desire to share your faith, but need something to stretch you out of your comfort zone, this is exactly the thing.
I don't know what else to say, but, "If you want to know, you have to go!"