I really like the lighting in this one. Surprisingly, the noisy areas are relatively contained overall, considering the number of iterations you used for the translucent materials you used here (like the water), and the light bounces. I don't know which compositing software you use, but there are some very handy plugins available which could clean up most of the noisy areas in post-processing, allowing you to render with similar iterations for production. Something like neatvideo.com is pretty much industry standard noise removal tool for AE, Final Cut, Avid and others. Unfortunately, the TOS prevents me from including a direct link to their site, but it can possibly help your workflow with path tracing engines like Iray.

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