How to keep a child busy for hours in the summer: DIY: Giant Ice Cube Awesomeness - filled with plastic animals, dinos, and such. And I'm sure you could put in food dye before its frozen to color it like the ice block in the photo.
KID SAFE Two-Color Oil and Water Discovery Bottles @ Play Trains! These vibrant discovery bottles contain no lamp oil, using all edible ingredients to make them safe for young children to make themselves!
We enhanced the water tray by adding a washing line. As well as wringing the clothes of water and in turn developing gross motor skills they also developed their fine motor skills by squeezing open the pegs! Also lots of fun!