Hello Peter...
I guess it depends on your sons age, experience and where he is surfing.
I think you said you are from the East Coast of Florida, I assume that there might be some brisk winds if he is Surfing there.
If he is younger, I would just suggest manual mode and follow him with you flying backwards toward the shore.
I think the tracking modes will slow you down and have you do a lot of editing.
I followed my daughter and her friend with my Typhoon H while they where kayaking on one of our local rivers.
the tracking modes and me flying manual didn't get me any good videos. They where TOO slow !
good for photos only.
Maybe look up surfing videos on youtube to get an idea of what your results would be, and use those idea.
Found this
It will be a learning experience for sure !@
Be sure to post your results !