PG offers extend your trip, both pre-cruise and post-cruise. Has anyone booked this when traveling with a 3rd person? My granddaughter in her late teens will be traveling with us. We were considering doing a couple of days pre-cruise in Moorea and a 3-night post-cruise in bora-bora. PG has the "extend your trip" and I would love to book these through PG, but they are based on 2 people. Has anyone ever added a 3rd person to the "extend your trip" through PG?