Background voices on video

During a water study, taking a video of Lake Champlain, in the background right in the middle of my video, from somewhere in the parking lot, a voice is recorded. Think not wanted in the video. 

I do not expect people to be silent if they happen to see a person taking a video. It is a public place. I can mute the background voices in editing. 

The problem is editing the film reveals there is more talking than what I thought at the time. A big section would have to be deleted. That is sad because I like the video images. I can’t upload the video as it is. Another video will have to be made. 

I now appreciate the value of using a script, a plan of what I want to film. 

Know what is to be recorded, the weather, the hour, the location. Take a few videos. Write down notes. Lesson learned.