Hmm. Possible topics that come to mind are...

Robert the Bruce vs. Braveheart (history vs hollywood)

How the clan system in Scotland (influenced its history, divided the people, enabled English rule, etc.)

The clan system and the Scottish identiy

Why the Highlanders and Lowlanders couldn't get along

The story of Glencoe (try a compare/contrast with the Scottish and English perspectives)

The Jacobite contribution (other than interesting shirts)

The story behind kilts, tartans, and pleats

Clan Cunningham/McLeod in any of those

Just a start... good luck