This summer we've made a point of taking the kids to every children's museum and science museum within a day's drive. (TG loves the local art museum, too, but TB can only do so much art.) They're good rainy day or too-hot-day activities, and the kids really enjoy them. We bought a family membership in our local museum, and discovered happily that it carries with it reciprocity for some pretty nifty museums in other relevant locales. We've already made back the membership fee twice in just a few months, and that's without even counting the tax deduction.