I added this to my Georgia post, but thought it deserved it's own post as well.
We have found a cool way to explore the national state parks. It's the Jr. Ranger program.
If you haven't done them yet, it's pretty cool! You get a booklet (I think this one was a few dollars) and your child has to do so many of the activities. They range from easy search word puzzles to finding information in an exhibit or along a trail or watching a video. When they're done, they turn it in and get a certificate and a pin badge. Some even give a fabric patch. Connor has done 3 so far. He got one here at our local state park for doing the booklet during summer camp, but you can do them at anytime. He also did one in Albuquerque last year at the Petroglyphs. He loves Civil War stuff and got do earn another badge at the Kennesaw State Park in GA. They had a demonstration and video. I think it's a great way to learn about different areas and events, plus they're neat side trips on vacation! And since most are outside, they're a great place to burn off some energy.
They also have Web Rangers. Where they can earn badges by completing activities online.
Check out http://www.nps.gov/learn/ to learn more about them.