Here is a really fun summer daycare activity involving colored ice cubes, the hot sun, and a sidewalk.  Kids love to learn, especially if they are learning while having a lot of fun.  One fun activity that we do in my daycare is we freeze ice cubes with washable paint in them.  We freeze all different colors.

 On a really warm afternoon, we will get our frozen, colored ice cubes and go out to the sidewalk and draw really cool pictures with them.  Of course, the ice cubes melt on the warm sidewalk, so our pictures are all watery at first, but as the sun warms the side walk, the water evaporates and leaves the color behind.  This is a really fun way to have a science discussion about evaporation while having a lot of fun.  The kids love this.