I have just finished reading Amazon Adventure by Willard Price, Here are my thoughts on it:
Was it a good Adventure? Yes it was, but it got a bit extreme at some points.
Were the characters well written? Yes, the main bad guy especially.
Was it educational? Yes definitely, Willard Price was a natural historian.
Was it suspenseful? Not to me it wasn't, but some people might find it so.
Would you recommend it? YES, it's good for home schoolers.
Your overall opinion. Well written, fun and you learn a lot, what more could you want?