Hi David,
Is this an original slide scan??? My guess is yes..as the contrast is huge! I like the color and comp.....but as presented it could use a toning down overall. I'll try to work on it tomorrow if nobody beats me to it!
Like you I have problems with the slide scans. I used to use those really saturated emulsions and the scans come out similar to yours. Details look good but contrast and saturation are high.
Try a reverse s-curve to tone contrast and a hue/saturation adjustment layer to reduce saturation.
I like the composition and colors. The trees almost appear to me to be an ocean surf breaking on the cliffs and the cliffs have a nice receding look into the image leading ones eye into it.