Disney has never had a particularly impressive Panama Canal itinerary. However, I booked the April 2018 westbound cruise because I wanted to sail on the re-imagined Wonder, and the longer repositioning cruises are
DCL's best values. I also like the sea days on DCL's longer cruises. If I wanted a port-intensive PC cruise, it wouldn't be on Disney. I only wish it departed later, as April 8 is so early.
FYI - both the 2017 and 2018 westbound PC cruises stop at Castaway Cay. Cartagena, Colombia fulfills the "distant foreign port" requirement. I'm glad Puntarenas, Costa Rica is a port stop, rather than a western Caribbean port.