Our team is in the midst of some restructuring and we are looking to have a fun team-building meeting for the leadership group - about 20 people. This will be on-site and about 1 hour in length.  I'm looking for some suggestions of activities to help get the group moving, talking, and getting to know each other better. 

There's no one new - we have all been here for awhile already but we are not yet as strong as a group as we need to be. The purpose of this meeting is really just to start building the relationships in a more fun, casual manner than the usual team meeting.

Has anyone done an activity that worked really well? Or ones that were duds that we should avoid?

Thanks for the help!