My boys are into history, so we have been visiting historical sites the last few summers. We really aren't beach people, but have gone to Lake Erie a few summers ago and are planning to go to that area again this coming summer on the way home from the Niagra Falls area in NY.
We go to Long Beach Island NJ every summer. I think it's especially important for us to go now because every tourist helps rebuild after Sandy. Other than that, we are trying to do more day trips.
Savannah, GA- we love the history. Destin, FL- we went there for our honey moon and stayed in an awesome resort. I also love going to where my husband grew up just because he and I can spend hours walking around the town and talking.
My husband and I were just talking about how we've both been to Europe (him to Germany, me to Rome) and we agreed that we'd both like to go to Ireland if we get the chance.
National Parks and State Parks. We love to camp at those : )