What a lovely idea - maybe by the time our children are grown up there will no longer be physical post cards? I still have a list of people who get an actual post card rather than a Facebook or Instagram update | Travel Advice | BabyGlobetrotters.Net
At the end of the school year send a few post cards with stamps home with each student and ask them to mail them to you when they have finished a book. Students could also send postcards to students in the same grade but at a different school and tell them about a book they finished,
Postcard Travel Journal. Buy postcards along the way of your trip and write what you did that day on the back: restaurants, funny stories, cool attractions. Don't forget to write the date! Hole punch and attach to binder ring.