I have a VERY active toddler. He is constantly running and jumping. If I don't provide him with something interesting to do, he is sure to go exploring on his own and find something to do. More often than not, he ends up getting into something he shouldn't be.
When I give him a little guidance and provide him with fun activities and projects, he is much more manageable and better behaved.
Great Summer Activities for Toddlers
Edible Play Dough for Toddlers