Here is a link to the best info on float trips in Arkansas:
Arkansas Canoe Club
They have links to water levels and the message board is teeming with people talking about where to go next weekend.
My recommendations if the water level is right -
Caddo River and Buffalo if you are inexperienced and taking children. If you want some more excitement the Mulberry is great. There is also a place on the Ouachita River called Dragover where you can camp and your put in is less than a quarter mile from the take out so you don't have to shuttle and you can run it as often as you like.
Be aware that all these places particularly the Buffalo and Spring will be crowded this weekend.
Keep your paddle wet and your head dry!