Palau is fantastic, the visibility in the water on a bad day is about 40 feet. I had a guy with a boat drop me off and I camped on an uninhabited island for 3 or 4 days, about 60 miles from town. Just fabulous. And I went on a boat trip to Ulong island - I've been on the beach where the current series of Survivor had one of their tribes based.
In Yap you can dive with Manta Rays, and in Truk there are something like 60 ships to dive on. Reptiles in the islands tend to be small lizards, sea turtles, and crocodles. And, of course, Brown Tree Snakes on Guam.
Zimbabwe was great for birds and lareg mammals, but I was there in July - Winter and the temp was only 28-30 Celcius during the day, too cool for herps so didn't see much at all. And I wouldn't recommend Zimbo as a holiday with the present political climate.
PNG was great and so was Belize, but I wasn't looking for herps in either place (although I did see one or two).
Check out my albums in my gallery at
http://www.aussiepythons.com/module...ame=gallery&file=index&include=view_album.php
I really need to add some more to it.
Hix