S.B.
You can do a fitness kind of day. Have a hopscotch mat down... they will love to hop around... get some balls and play catch, get a big blanket and do like the parachute kind of thing where you put the ball in the middle and make it rise up in the air.
Arts... finger painting, drawing with marker and crayons... being able to cut with blunt scissors, making art out of white paper plates.
Blow up balloons and make silly faces on them and play bounce the balloon back and forth.
Dance day... where music is being played and they all wiggle and giggle together.