At this point, it should be fairly easy to sneak Holly off the ship, since nobody's really paying attention to what the party's doing. They're more concerned about what's out there...
Fenris and Dallic volunteer to climb up first, then pulley everyone else up. *sound of dice rolling* Dallic slips, but Fenris manages to catch him, and after 2 hours of painstaking effort they make it to the top and start pulling everyone else up. You can see that the only building standing on top of this mountain is the lightning bolt shaped one. There does not appear to be anyone here.