Cumberland and Eagle Falls is good for a quick stop, though Cumberland without Eagle Falls is a total waste, IMO. Walk to a viewpoint, look at a big waterfall, and leave.
The lip of Eagle Falls is an arch, btw. The water flows over and through it. Pretty cool.
Big South Fork is *right there*, so why not include it?
You'll be very close to Yahoo Falls and Yahoo Arch, short and easy.
Not so short or easy, but Lick Creek Falls from the top would be my preference over either of those if the water's flowing, plus least likely to be crowded, maybe(?).
Mid-August is definitely not a time I go on "waterfall tours", and might make that a poor choice, given how low the flow is even in winter. Hard not to mention it, though. Always a favorite.
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Hey, the Honey Creek Loop's <6miles, and there are places to camp near the TH