Cool suggestions! Thanks! I've done a lot of these things. And I have noticed that my 7 and 3 year old got on my nerves most when I didn't plan anything for them to do or acted like it didn't want to be bothered on a couple of occasions.
We went to the Center for Puppetry, to the free programs at the library, to the park, to Savannah to visit my parents and the beach, to the movies (including the $1 and $2 movies), and I enrolled them in a couple of week long camps. They also stayed with the grandparents for a week. We played games, read, and watched movies together and played with bubbles and balls outside at home too.