It may sound weird, but the first day for our students is tomorrow. I actually like the idea of kids' coming to school for only two days and then having a weekend, it's like dipping your foot into the pool before diving in.
I spend the first two days on introducing myself, my philosophy of teaching, and generally how I run things in class--letting the students know what they can expect.
In the past I've usually just talked. It's not necessarily a bad thing, especially at the beginning of school when most actually seem to listen and take notes (I teach mostly high achieving students), but I thought that this year I'd make it a little more fun for all of us. I saw on a colleague's Facebook page that someone suggested using internet memes when discussing classroom rules and the like, and upon reading that I took the ball and ran with it. This is the site I used, and here are a couple I made: