Take the tour. From Kit. He's very knowledgeable and enthusiastic.
The museum is fairly small. The tour with the guided tour is worth it in my opinion. My boys loved the interaction with the tour guide.
The tour was worth it.
You can walk around the grounds for free.
They charge a smaller fee just for the museum and grounds. The museum is fairly small. There is a great video by Ken Burns on Twain's life that last 23 minutes. There is an exhibition on the second floor on print making related to Twain and a snack bar.
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