Recommendations for Canoe/Fishing trip to Northern Arkansas

IF it was up to me I'd pick the Spring River near Hardy, AR

Water levels are all over the place the deeper you get into the summer. Kings River best eureka springs is spring fed and would have stuff to do at night if you camped in the area. You can easily access good stretches of Buffalo, white or mulberry if the river is right from there.

The Spring River is not a bad idea. There is a cabin on VRBO that can handle quite a few folks, and you can catch all the trout you want in front of the cabin. There are also plenty of options on floating the Spring. That would put you bout hr and half from Blanchard Springs Caverns, which would be worth the trip. If you go with staying on the White near Calico rock you can rent a boat at couple different places where the White meets the Norfork. That area of the river is not hard to handle fishing on your own.

There is actually a sink hole in the spring river that's caused a whirlpool that has killed two people. May want to look at another river.

There are a bunch of resorts on the white river with Gaston's being probably the best/most widely known.