As I read through some of the responses to this question, I noticed that there was a great site listed for 2nd grade. This made me curious as to whether there was an extension for 5th grade...and there certainly was! The site is https://ep-storytown.wikispaces.com/5th_Grade. It intrigued me because of how closely it aligned with much of what I teach: grammar, parts of speech, punctuation, etc. When I clicked on one of the activities for punctuating sentences, I was pleased to find a colorful activity that was clear in direction and purpose. I could envision using this site as a tool for practicing and reinforcing concepts in the classroom. It seems both informative and fun in nature!