What To Do, What To Do?

I find the hardest thing for me on a daily basis is finding something for us to do. Here in NJ, the weather has been unbearably hot and humid this summer making it impossible to have the kids outside for extended periods of time, or any time at all for that matter. I am fortunate enough to have a big yard with shade and a pool but the 4 year old gets bored quickly and I really can't handle the 2 of them alone in the pool. Turns out baby boy is WILD in the water so he needs my full attention. Keeping busy in the house starts to wear on everyone, especially me. "Mommy. Mommy. Mommy." How many times can I hear that through the course of the day? There's only so much mall-walking we can do, especially with a bored 4 year old. Everything is either expensive or outdoors. It literally gets to the point where the baby comes at me with his sandals in his hand looking to get out of the house. Whine, whine, whine, blah, blah, blah. Bottom line, what do I do with the kids today?