The straight between New Ireland and Rabaul should be crowdy, if you don't mind the planes. And as far as i know, this kind of mission objective does not prevent you to sink ships anywhere in the map.
Rabaul is a military base, there should be some nice targets there, maybe even battleships or fleet carriers. If you woke up this morning feeling like Gunther Prien, try a raid there! Should be close to impossible though, the harbor is inside a tight bay and escorts should be everywhere.
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