Flubber is a fun, very elastic version of playdough. Almost like stretchy silly putty. It really is fun to make! Buy the glue in bulk - usually you can find it in a gallon jug at craft or school supply stores. Here is the  more...

My kids (2 and 3) love to play with water and bubbles, and a great way for them to cool off and help out is to make a washing center outside.  We bring two large plastic underbed boxes outside, fill one with water and  more...