We are doing a B2B from HNL to SYD then SYD to SIN.  When we arrive Sydney, what procedures will we incur?  I read somewhere a while back that all the B2Bers have to disembark the ship and go thru immigration when we arrive Sydney.  Once completed, if you reboard the ship for the 2nd leg, you aren't allowed to leave the ship after that.  Is that the case?  We want to tour a bit of Sydney on turnaround day, but from what I read, if you reboard the ship, you are stuck on board until it sails.