How to bake lightmaps with individual object settings?

Hello,

I'm building a scene that uses a water effect made with planes similar to WindWaker's rivers/sea with a white border texture around the edges.

I want these planes to be lightmapped with shadows (receive but not cast) and light bouncing etc however the ambient occlusion is doing multiple effects on the planes that I don't like. I like the effect of AO everywhere else just not on these planes.

Here is some screenshots of what I'm talking about:

How can I bake the scene with ambient occlusion but exclude the water planes from only the ambient occlusion part.

Thanks for your help