I like raiding the harbors, easy kills most of the time but it requires a different mindset. You can no longer be the stealth ninja, you have to become the big mean great white that eats everything in its path.
Of Course you want to remain undetected as long as possible and get the Photos!, but its less important to play hide and seek when raiding. Due to the shallow waters you will be detected anyway so go in Fighting, but stay submerged at all costs and beware of mines!
If theres a DD between you and your target, make him a priority and send him to the bottom as you fight your way to the target.
Also, Forget running slow and silent, open those electric engines up and stay out from directly under any attackers with full rudder, Your not going to escape to the depths and you can usually avoid most DCs and then go for the bow/stern shot as the target is trying to turn in for another pass.
This will burn the batteries faster, so make sure you have an escape to sea option planned by the time you have 35% Battery left.
Your Docked Targets won't go anywhere, Worst case you can go 2000-5000 yards out to sea and deckgun em to death if you use all your fish.
So takeout any patrols first and you can wipeout the entire harbor pretty easy. Sometimes you find some cool targets hiding in the ports, Battleships and Carriers are always fun to watch sink.
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