DD6 loved/still loves starfall there are lots of different reading activities to do and as they become better readers they can read the things themselves and then do some of the more fun activities that go with it.
I am a big fan of painting the sidewalk with water and chalk and "sidewalk paint" (to make this put equal amounts of corn starch and water in a container with a cover, add some food coloring, cover and shake - do not try to mix with a spoon, as the corn starch doesn't allow this to work) then get a paint brush and you're good to go.
We tried to get a theme going for the sidewalk paintings, and this usually kept dd busy for a few days becasue she always thought of more things to add to each original picture of the theme.

Of course, having given you these ideas, I am also constantly looking for things to keep the kids busy, and it is exhausting.