That used to happen to me, but it was opening up behind whatever window I was using. Of course, at the time I didn't know what a pop up stopper was. I am getting it even with pop-ups blocked.

Melissa, good choice for the second day! You will get 2 of the 3-4 viewpoints that are on the one that is just 4x4, with a bonus of snorkeling at a specially selected place. As I remember, snorkeling on the BB motu was not great when I was there, as currents were running. My son's girlfriend was kayaking, and she literally had to drag the thing back to where she started, couldn't paddle fast enough against the currents to get back to where they keep the boats.