What would anyone suggest for a group hike of 25-30 miles in Mid - May?

I am taking a group of college age hikers on their second backpacking outing. (I think that means they are more comfortable about what to expect but still learning), right after the end of the semester.

Our target is one day of driving from Dallas. We are actually closer to Houston but Dallas gives a good point of reference.

They want to see trees, waterfalls, rivers/streams, and mountains of some level. They are ground dwellers but I am working on them.

We plan on a 3 day hike and are open to a loop or straight hike.

I loved the Buffalo River area when I was there recently as well as the Ozark Highland Trail from the mile or so I have seen of it.

Ouchita's are something to consider as well. I hear good things about Eagle Rock Loop but understand that tick season will be in full swing. (Not a deal buster but something to consider.)

With a good drive we could get further north into Missouri which for me is uncharted territory.

I appreciate any ideas.