I'm trying to put up an "I'm done...now what?" board in my classroom to use for students that finish activities, tests, etc early. It doesn't happen too often in my biology classes but my marine sci classes are mixed levels because they're an elective and even with levels and differentiation, I have some more advanced kids that will always finish early. I don't necessarily want to give them more work, nor do I want things that will be extra credit (because some of them will speed through their work to get to the extra credit). Right now, I have "check your work", "finish any unfinished classwork", "file papers into folders" (I have a file system to return ungraded work) and "read a science book or magazine" (I have a stack of nonfiction books, popular science/mechanics magazines, etc). I have some students that will help reorganize science equipment and lab supplies, but I don't really want to make that an option for all of my students. If you have one of these boards, what other kinds of activities do you have?