Split or graduated neutral density filter - clear on half and ND on the other.
This will leave the clear part as is and bring down the ND part by the number of stops the filter is.
They come in at least two different strengths.
But because the blown out area is mostly a circle and not a horizon, the line separating the clear from ND might be hard to hide as it goes through the trees.
I haven't done it, but you can combine multiple exposures, exposing for the highlights in one and darker areas in another.
Someone else will have to give instructions - I'm not even sure the Elements 4.0 that I'm running will do it.
FWIW - I find the half a rock in the bottom left a little distracting. I'd like to see all of it or none of it. I don't know if that vantage point was possible.
I do like the saturated colors and texture of the water and the overall feel of the photo. The blown out sky is the main issue.
I came; I saw; I shot; I shared.