I guess that would depend on what you are traveling to see. I would highly recommend the state parks along with the Buffalo National River, or possibly dig for your own diamond at Mufreesboro. Depends on the traveler.
My favorite is watching bald eagles in January on several major lakes and rivers. Go to Arkansas Parks and Tourism web site. Lots of great ideas. My favorite is Mount Magazine.
If you need more reasons than those pictures (which are just a few out of hundreds) then you are probably from California and should probably stay out there.