So, there is something called the RETREAT PASS, which gets you full access to all the Suite/Retreat amenities. There is only 2-4 per cruise for certain circumstances. 1. One needs to be just got into The Retreat, no other Retreat Suites available anymore to upgrade/upsell the other couple. They still need to be as well on the move up program with a high bid in case something becomes available further towards the cruise and they will lock in those prices, we sail in one week. Then it is roughly $100 per person a day. They do not count nights, so our 4 night was counted as 5 days. $1000 extra for them to be with us and not have a Suite.
So just in case you book a Suite and your kids or friends in a regular room, and Suites are available that time they will not get that pass.