In my Spanish I (and sometimes II) classes, I give them secret pen pals between class periods. This is the assignment and rubric for their first introduction letter. It includes a full rubric! I will upload the rest of the pen pal assignments that I do throughout the year, such as Day of the Dead, Christmas, etc.
PS- The way that I do pen pals is through classroom Spanish names! They really like it, and it is great for their writing/ reading skills.