I-30 is the route we usually drive when coming in from Fort Worth, too. South and east Arkansas is mostly low lands, ride fields, etc. with nothing much of interest. Little Rock us going to be your first "hit" on somewhere to stay, etc. DO NOT make the mistake of thinking Burns Park in North Little Rock is a place to go....really bad to the point of plain dangerous with fangs, drugs, etc. When you mentioned having a young son, I told my wife about your post and we agreed Magazine Mountain might not be something you want to try. Petit Jean is great; lots of easy trails like Turtle a Rocks and the Bear Cave area. Also an easy trail to the falls. Maumelle Park in west Little Rock is going to be your best bet for camping in Little Rock and Pinnacle Mountain park has lots of easy trails, like the Kingfisher and Base trails. You can also go to the peak of Pinnacle, though I would rate it as moderate. Eureka Springs can also be nice but it sometimes attracts some rough crowds. Not dangerous, just loud and obnoxious. Check out Bentonville, too, especially Friday nights at the town square for families and the farmers' market on the square on Saturday morning. Your boy will probably enjoy the Amazeum there, too. When we're there (our son lives there), we stay at The Creeks in Cave Springs. It's RV only and nothing for kids but it's pretty limited choices up there. Have fun!
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Gigi, Poppy and Sadie Lady...On the road, but not full time!