We know now that she did.
Didn't some tourist say she had been on a boat like that the last day she was there? I seem to remember, a booze cruise.
Where can I find that info Rippersnapper? The reason I ask is because it is being posted
From SM:
I am pretty sure it was established that some kids did go on that cruise but that Natalee was not one of them (by Dash).
And I believe the couple with photos were on a snorkeling cruise, not the Tattoo party boat. That was also covered by postings from her friends, a few threads back. The couple said they were surprised she had the energy to dance at C & C's because they were exhausted from the snorkeling trip and she had been on it too.