Can you give me a list of fun activities to do at the wedding reception?

Besides the regular reception activities, eating, toasting, dancing, cake cutting, throwing bouquet, etc. you could have picture boards with bride/groom growing up or slide shows of bride/groom's growing up, professional dancers or entertainers, wandering musicians, solo singers, readings/speeches, the dollar dance, disposable cameras on each table for guests to take candid photos with, etc. Sometimes DJs have props and play games with guests and/or live bands are always entertaining to watch.

Guests are probably not expecting lots of activities at a wedding reception and are happy to be fed and visit with you, other family members and each other.