Which trail to take to see the waterfalls?

There are several ones; such as Overall Run Falls, Dark Hollow Falls, South River Falls, Rose River Falls, Lewis Falls, Doyles River Falls, Jones Run Falls, Brown Gap Waterfall loop, ...

I didn't go on trails just stopped at the overlooks to take pictures. Sorry.

There are several falls on skyline drive you can ask a ranger at one of the ranger stations

For easy hike, Dark Hollow Falls, just outside Big Meadow camp ground.