has some great ideas:
I went with her simple but very effective suitcase made out of large construction paper, stapled together on three sides and then stapling strips on to make handles. My kids love them and they work pretty well.
She also has a printable passport file. I make passports for each student that has a page for each country we visit. After we study a country, I ask them questions about Christmas in that country. If they answer all the questions, I "stamp" that page of their passport by giving them a sticker.
She also has a printable plane ticket. I use those to tie in number or letter matching. I hide numbers or letters under the chairs then hand out tickets to the kids before we visit a certain country. They have to find their seat on the plane by matching the number/letter to their ticket. Depending on the group, I've also done more difficult things like hiding sums under the chairs, rhyming words, etc.
Hope this helps! It's my favorite unit.