Here is idea I saw over at Inspireco and I can't wait to try this one also.
Freeze a bunch of waterproof toys into a block of ice. Just pour the water into the container (whatever will fit in your freezer) and pile in the toys. Little plastic animals where used here but you can use whatever your child likes. Give your little one some toy tools like a plastic hammer and a squirt bottle and watch the fun begin!
P.S. Sue the bunnies are growing fast. So are the baby quail.