adk dib'
The "best" route to the slide follows Slide brook proper. If you reach Slide Brook leanto, go back to the wooden bridge that crosses slide brook. As of two years ago, a large tree had fallen onto it, and damaged part of it. That is the start of the best route. There are many false paths that will peter out, especially infront of the leanto. If you get into one of those, head due south and you will pick the 'best' rout up in a couple hundred yards.
If given the choice of returning via the slide, or by Lillian Brook, opt for the slide! Mega blowdown along Lillian Brook. The slide isn't real steep, and it's loose gravel, not hard slab.