Sure enough, about 10 minutes later the sun broke through and the rainbow was so strong that the rainbow in the first few shots I took was overexposed. Once I made the proper adjustments, the secondary rainbow appeared and I made this exposure. The second rainbow is the reverse of the main one, with blue being on the outside of the arc. Look up "double rainbow" and there is lots of information if you are curious. Also if you look it up, there will be an explanation as to why the sky is darker outside of the brightest rainbow. If you see photos where the sky is the same color inside and outside of the rainbow, it is probably a fake! See here for more.
The reason I stood there with the camera on the tripod is that I had a good composition and was waiting for the rainbow to appear. I did not want just a 'rainbow shot' but rather a seascape with a rainbow in it!