Last July we stayed at Ray Behrens Corps of Engineers Campground at Mark Twain Lake in Vandalia, MO, about 45 minutes from Hannibal (Mark Twain's birthplace). There is also a state park at the lake, but we stayed at the CoE campground. The campground has huge sites, some open with grass and a few trees to heavily wooded. Full hook-ups, unusual for CoE, are available for $22 a night. Camping fees are half price if you have an America the Beautiful Pass. There was a fairly large non-reservation section which is helpful if you want to make a last-minute stop. I recommend reservations if you are arriving on a weekend, however.
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