I'll second the Current River. It is beautiful and clear, with good fishing. (or at least it used to be so)

I never floated the Current River but I swam in it every summer for 9 or 10 years while growing up & visiting kinfolk in Arkansas. My kin had a friend with a cabin, a dock & a flat bottom boat, on the river.

Arkansas is a wonderful place & I often wish I had the time & money to just go spend a month exploring.

I have to tell a story my dad told many times.
He was born & raised in Arkansas outside a little hamlet called Bay Village and he had to walk several miles along dirt roads to school as a kid, which was normal for those parts back in the early 40's (my mother grew up in a house at the dead end of a dirt road that ended up against a long slough, and had one neighboring family, & rode a horse 4 miles to school, same area. Dad died in the early 90's, but I got to visit the area & explore mom's memories with her 4 or 5 yrs ago. It's still a 4 mile dead end dirt road against a slough, with the same old decrepit house she grew up in & SOMEBODY LIVES THERE, the neighboring house is vacant & broken down. It all looks so like the Beverly Hillbillies shack, and is just a few miles from the Clampet Cemetery.) Back to my dad... And so it was that one day my dad & a friend decided to play hooky from school and go swimming instead. There was a small bridge to cross on the way to school over a stream with a diving/swimming hole under the bridge. And that was the where they stopped & stripped to swim. My dad said he dove in first and glided under the water. His friend still on the bridge saw a water moccasin dash out from the bank and bump my dad's leg as he glided by. When he surfaced the friend called out asking if he'd been bit. My dad hadn't felt anything & didn't know what happened, but when he checked, he'd been bit. They agreed to let my dad stay there while the friend ran back and got my grandfather. Instead of getting excited about the crisis my grandfather walked out (didn't have a car, just a tractor) and took his time. Then got my dad and made him walk back to the house. My dad said it was the worst pain of his life & he was so sick for a week he just wanted to die. There was a hollowed out place on his calf from where the snake had bit him.

Water moccasins are territorial, aggressive, don't rattle or hiss or give any warning and will chase you through the grass (or water) just to bite you AND will swim out, crawl into your boat to bite you at night.

I can't stop now...
My maternal grandfather, who lived just over the state line from Ark. in Missouri, had known a man that died from multiple water moccasin bites. This man was water skiing on a lake and was tiring and wanted to drop. He saw what looked like a deflated inner tube floating just under the water and dropped near it. It was several water moccasin intertwined together and they bit him severely.

I've seen water moccasin's in Ark. while exploring sloughs & creeks in my youth and they are scary just because of their thickness. It is surprising how big they are.

Anyway..., uh yeah, I never saw water moccasins on the Current River.