This tray leaves lots of room for your child's imagination. The main sensory bits are: Edible Sand - polenta and cous cous (left over from a previous tray) Water - two different shades of blue sand. Real stones
Add lego people so your kids can make their own pirates.
I included the submarine to encourage exploring the bottom of the sea where I hid microscopic shapes (printed on a blue paper). Your kids might want a magnifying glass to check what they are.
If you are working on improving your kids writing skills include bottles with pieces of paper to write the rescue messages, or maybe design a map to hidden treasure.
To practice 1:1 correspondence, one more and one less, number recognition and understanding numbers I put clear cubes with numbers on them to store the treasure.
Here are some themed books that you could display to extend learning.