The Ark is only a 1 day trip visit, especially if you are going later this year. (Not during summer break, Christmas Vacation.) It has been about 2 years since we've been there, so I do not know what their current rates are for multiple days. But it is a easy 1 day visit. The Creation Museum takes about a 1 1/2 days to fully enjoy and experience. Our family makes a trip there once every 2-3 years.
If I was told that I could go to anywhere in the US without a doubt it would be the Ark and Creation Museum.