HELP ME PLEASE! babysitting problem...

I babysit some kids every once in a while. They are 8, 5, and 3. the last time I did we made a big "obstacle course" all through out the house. All of them loved it. another time I brought my bathing suit with me and we played with the hose in the backyard.They got sooo excited when I told them i brought my bathing suit with me. We have also done a scavenger hunt before. I think they liked finding the next clue more than actually finding the prize at the end. The way i did it was that I would draw a piece of furniture or like a flower pot the was in the backyard on a piece of paper and they knew to go look there for the clue.