I just spent two hours with 30 eight year olds, and yet I am refreshed
I am really kicking myself for going this long without visiting the Kruckeberg Botanical Garden, which is about 15 minutes from house. It is absolutely marvelous, an amazing array of plants and lots of useful signs about what you are looking at, and a lovely, quiet green oasis. (Okay, it wasn't quiet with all the 8 year olds, but it is unlikely that there will be 2nd grade field trips going on during normal visit hours.)
Admission is free. And they are having a sale of native and rare plants this weekend.