Themes

I'm rolling ideas around in my head about how to keep the kids occupied this summer. I'm thinking that we should have a theme for each week. We can walk to the library and pick out books. After lunch we can read books on each theme before nap time. We could also do a few activities throughout the week. Not every thing would be based on the theme, just as a jumping off point. I need theme ideas. I have a few and I am trying to covertly pull ideas out of the kids., but i need more. Help me!