E.P.
When my children were that age, I loved getting them creative toys, dress-up stuff, art supplies kitchen sets/forts, music and musical instruments (yes, it would get loud!). A small puppet theatre would be nice and it could be converted into a lemonade stand in the summer. When my kids were that age, before they went to bed, I would do a 5 minute, impromptu puppet show with their stuffed animals and there would always be some silly problem that needed to be resolved(i.e. bullying, not sharing, eating too much,...). To this day, my 12 and 9 year old are good, problem solvers and very creative and musically inclined.