355H: YA book with puffins and an island (Solved!)

I read a book in the late 70s or early 80s.  I think it was a 60s/early 70s book, but that’s little more than a guess.
A few years later a children’s section librarian helped me find the book again and she knew exactly what I was talking about.  Whether that speaks to the popularity of the book, or the quality of the librarian I don’t know.  🙂
The story is a number of children having adventures on an island while their parents are busy.  Researchers I think?
Puffins are involved somehow, and I THINK that is part of the name, although whether it’s the name of the book or the island I’m not sure.
They get to the island via seaplane and I think there was a seaplane on the cover.
There were at least 2 books, maybe more.
Not much, I know.  🙂
It’s funny how strong the memory of loving the book is, yet so few details remain.

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