How do you entertain a 3 year old?

If his name is Maddox, just give him some running water and you have it made! While at a park for a family reunion he quickly discovered the water source. So he gets a little wet......no big deal, right? Well, we didn't expect him to get on his hands and knees and drink the water from the puddle that had formed on the ground. He thought it was so much fun to lap up the water like a dog and then spit it out. I guess if that is the worst he does, then I think we'll be okay.