Thank you all for the responses.

I did notice the noise reduction option and was wondering how that worked. I'll give that a go and see if that takes care of most of the noise.

I just thought at iso 100, even at 20-30 seconds, that it should be relatively noise free. I need to do some night shots and see how bad off it'll be.

Is any of this, noise-wise, related to the fact that I'm using the lens that came with the kit or is it only the camera?