Visited the Puerto Princesa Underground River for the first time with Tin last August 2011, we were supposed to go there in December 2005 but the strong rains prevented us from going. Although I have seen photos and videos of the Underground River many times, the experience of seeing it personally was very different and it would really make you feel that it really deserves to be one of the 7 New Wonders of Nature.
The PPUR is currently in the Top 10 as of Nov 6. Voting for the new 7 wonders is until November 10, 2011 only.
To Vote, just go to http://www.new7wonders.com/vote-2 or Text PPUR to 2861.