This is an activity that you can do to accompany any colonial unit. My students pretend the have moved to each of the colonial regions (New England, Middle, and Southern Colonies) and write a letter back to some one back "home" in England. They tell which region and colony they live in, what their occupation is, and what the climate is like there.
Included is a student instruction page and rubric for a Colonial Post Card Project. All the students need is index cards to use as "postcards". I have used this project with 4th graders, but it could be modified for 3rd or 5th grades.