Were you dragging a swimming buoy? If not then it can be nearly impossible to spot swimmers. Our boats do go into the shallows on a routine run. No doubt the captain was actually concerned for you and for the others that would be impacted if you did get run over. We have a lot more boat traffic now and not all Captains are as experienced other others. Perhaps working with the tour guide association in conjunction with the Coastal management team some swimming lanes can be established.