What to do when bored?!?

A plain boring field sounds like the perfect place to take your dog. Maybe you could take a Frisbee or tennis ball along or something. If the heat is a problem, you could do it early in the morning or wait until the sun is setting. Also, you could read. There are tons of great books out there. If you can't buy them, go to a library. Spending a couple of hours at the library is one of my favorite things to do.