Little known fact: Indoor air quality can be up to 100x worse than outdoor air quality.
Which is to say that if you are keeping your kids inside because you are worried about allergies or whatnot you aren't doing them or yourself any favors.
And when you have a day like yesterday, which was so very pleasant after all the hotness, you can almost start to see the possibility of spending some quality outdoor time with the kids.
Which is where the Be Out There Outdoor Guide comes in handy. Also, the Google, which gives almost half a million hits if you type in "dallas nature center". There are quite a few little nature preserves in the Metroplex, you just have to look.