A sensory bin with sand or beans would be a great idea. I like the idea of hiding items in the bin and having students find them. You could even add an academic piece where they are required to search for objects that are a specific shape or measurement.
SCIENCE FOR CHILDREN-Having already done this, it was a great addition for sand and sensory for even toddlers. Developmentally appropriate for children of all ages depending on what is added. Will absolutely do this again and again, the children loved it!