It is great to have ice-breakers on the first day of class – I like this game of Human Bingo where everyone goes around the class looking for people who fit the boxes on their card. Once one or two people complete a line the game stops – but then it is fun to go through the items on a card and ask students to stand up if they match that criterion. It’s a good way for students to get to know each other.
Also consider a syllabus scavenger hunt – a college or library scavenger hunt where students work together in small groups or a myth-busting demo!
Here are some other sources you might find useful:
Lots of ice breaking ideas here:
This site makes specific suggestions for a first-day lesson plan