I would have them introduce themselves and talk about what they are hoping to get from the course, why they are there, etc. Then I would definitely give them some kind of getting to know each other activity where they get to know at least one other student and report back what they find out.
Some activities I use (from my own site):http://eslgames.com/first-lesson-interv ... r-student/http://eslgames.com/opinion+cardshttp://eslgames.com/esl-conversation-questions
(namely, the getting to know each other questions)
Sometimes I throw in a quick, general grammar test just to see if there are any gaping holes in their knowledge.