We finished a 4xB2B in June....some of the similar destinations that you have planned, although it began with a Transatlantic. Honestly, even if menus/entertainment repeated, the last three cruises were so port intensive (as yours will be), we didn't care at all. We were never bored; spent time planning our port stops and looking at maps. And during downtime, searched the website for future cruises! Back to backs are our new obsession; only way we book these days! Won't take long for all crew/staff and officers to know you by name!! Enjoy your cruises!!