Have the girls make bracelets and take them to a local nursing home. Be sure to call ahead and make sure it is okay that you come. Prepare the girls by explaining what a nursing home is and why people are there.
It was great to see how excited the ladies were to get their bracelets and to see the girls talk with them. Even though they are so young they were really touched.
You could even have the girls sing a few songs before you leave.