You are lucky to be going to some of the most beautiful land and water in the country. It’s called Buffalo River country around here and people like me daydream about being there while working in our offices.
Be sure and see the warnings about Hawksbill Crag (Whitaker Point.) Part of the trail is dangerous – You will be fine if you stay focused on your footing.
If you want to take the time to research Arkansas trails and waterfalls this is the best collection of books available:
My two favorite things to do in the area would be a float on the upper Buffalo and take the short hike into Lost Valley.
Some waterfalls and the best float (Ponca to Pruitt) will be iffy this time of year. The following website will let you know whether the upper Buffalo is floatable as it varies with rainfall as do most all of the waterfalls.
Today the river is floatable and some falls are flowing in the state. But fear not – the lower Buffalo is floatable year round and stretches of it (like the short easy stretch between Buffalo Point and Rush) are as beautiful as the upper Buff.
As to camping, the Buffalo River National Park has some nice campgrounds but some may be closed or have limited service right now due to the cutback in federal services. Here is the website to check that: