Yeah I'll have to agree, besides the above there was no parking along the loop drive. If you wanted to look at any of the sites away from the HQ you had to hoof it in from the parking lot there. We didn't have a problem parking while pulling our 5ver tho.
I found the park much more interesting than I expected. I've been by it several times in the past and never stopped there, but my son wanted to see it so we stopped. It helps if you are familiar with what happened there.