Something fun to incorporate at your wedding are wedding advice cards. Give your guests a fun activity by asking them to fill out the advice card at their place setting and put it into a designated box before they leave. Everyone gets to share their advice for the happy couple and you have something fun to read later! You could even save the box of advice cards to read at a later date (like your first or tenth anniversary)!
A fun twist on the advice card: Advice Mad-Libs. Many (like the one below) can be found on Etsy!