Build a fort or castle out of cardboard boxes and some imagination.
When you are through with the cardboard box as a fort or castle then take it to the nearest hill in the neighborhood and use the box to slide down the grass like a sled without the snow.
For rainy days nothing is more fun than making a fort out of blankets and chairs. Find some cheap burlap fabric and some cane poles and make a tepee in the backyard or scale down materials for inside.
One of my favorite things when I was a kid was my brother and I would play with those cheap sets of small plastic cowboys and Indians or army men figures. We would set them up outside and dig rivers and make mountains spending all day setting them up just to knock them all down with a ball or what ever struck or fancy that day.
Get a book on trees, plants, wild flowers, rocks, etc and take a walk in the woods and teach her how to identify what you see on your walk.
Lay on you back on a blanket in the yard and play that cloud looks like. . . and take turns telling what you think the clouds looks like with a little made up story to go along with the description.
I babysit for three little boys that were notoriously picky eaters. When they would eat and not cause a fuss I would let them pick a CD and dance on the kitchen breakfast bar like a runway. It worked every time they loved the fact it was a bit of a forbidden thing.(Strict rules about no climbing inside or outside)
