There's also a Crocodile Park in Davao.
Just giving a well deserved plug for my son-in-law who is tourism manager for Philip S Dizon (PSD Group of Companies).
See here for croc park:-
http://psdgroupph.com/index.php
and here for other attractions:-
http://psdgroupph.com
He actually appeared in the TV program Trip Na Trip when they visited a number of attractions in and around Davao
We're lucky to have him organise loads of trip for us, at special prices too ( I like that).