A hot day in Boston.  What could be better than a trip to the leafy sculpture garden at the DeCordova Museum?   Try to help the red man climb out of the Earth.  Build dams in the stream in the Rain Gates.  Tap on the Two Black Hearts to see if they hollow.  Try to take out the stovetop espresso maker embedded in one of the hearts.There is a lot more to see and do in the garden.  The Museum itself is in a lovely building. You can see the faux château roofs as you walk around the garden.  It has interesting exhibits and a little café that serves pre-made sandwiches and salads.  But the Museum is not the reason to go to the DeCordova.  It is the sculpture garden that makes it worth the trip.