I am trying to figure out a way to have visitors to come back to my site more frequently and I thought about setting up a question/answer game where I will post some questions every week and the visitors will send me their answers (I would like to receive the answers via email). Then, at the end of, let's say, 3 weeks, I will select one winner and send this person a small appreciation gift.
I could do this using comments, but because I want to receive the responses via email I hit a wall.
Can someone help me with this? Or, if you've done something in the same lines, send me suggestions of another way I can set this thing up.