For the final memory task, I've noticed a pattern: So far the first task in each leg was to find a person
Leg One: Find Javier for the paragliding
Leg Two: Find the Officer of the day on board Esmeralda
I think in the third leg in Lisbon they have again to find someone. If that's the first task, it could mean something.
Maybe it doesn't even need to be the first one but just remembering A NAME of someone you have met during every Leg could be a thing, is harder that remembering a Place or a Face... Arturo Prat could be the name on Leg 2...
Leg 3: Find the Portuguese singer in a red? dress (stagecoach painting clue)
If Norway will require finding a person, it's a definite lock or else in Juneau I would be shocked.
It didn't hold up, Leg 4 didn't have anyone in particular, maybe the people at the pitstop party?
Could there be a transportation memory task?
We've seen different modes of transportation in all the legs so far.
Leg 1 (Gliders), Leg 2 (Bikes), Leg 3 (Trolley), Leg 4 (Speedboat)
If this is right, then Gdansk, Poland will likely feature a ferry.