Of course, I saw this on Pinterest. A Tupperware filled with little toys and things and then filled with water and a few drops of food coloring. Put it in the freezer and out comes an hour or so of fun playtime even on a day when it's 105' or so outside. The hot day actually helped it soften up enough to make it fun. If you live somewhere cold, you might need some more sophisticated tools.
We've been all over the place already this summer and I know I haven't been keeping up here. Off again tomorrow. Promise to take lots of photos at legoland!