How may wind generators are too many?

We had to have a picture of this windmill farm. We wondered if these boats vibrated when the wind was up.

We left Marathon Key in Florida at 4:30 PM to cross the gulfstream as it was important to arrive in the Bahamas in the morning (the better to see). We were finally on our way to cross the dreaded gulfstream. We waited for favorable winds (never want to cross when the wind is from the north or northeast) from the south which means that the wind is with the gulfstream current and the waves are lower. It was uneventful but we were glad to have that behind us. We pulled in Chub Cay 26 hours later.