Hands on activity using Skittles shows how the phases of the moon result in low, high, spring, and neap tides and lunar and solar eclipses.
8 Station activity with student assistants. (these will be your higher level students-good way to show differentiation is taking place within the classroom)
The main part of the activity can be used as an assessment if you like at the end. I use Skittles because they can be moved around easily to represent the positions of the Earth, Moon, and Sun and my students are more engaged when they get to eat junk food. (: