Diving Princess-
Sorry its taken me a bit to respond. Your are absolutely correct, this is the downside of the lack of predators and why the gov't of Ecuador must take action. Problem is, I don't think they will, at least not until its too late. There are mixed opinions of how to deal with this, but I side with the camp of controlled tourism. Severly limiting the tourism will only encourage those with evil motives to take advantages of the lack tourism to exploit the islands and their population for profit. It is a huge dilemma and I don't know the answer, but I would absolutely tell you to go.
Separately, I spent 4 great years in DC working on the hill. You live in a great part of the country, enjoy!
Thanks Steen- its a must do. Truly magical.