Why not Guadalcanal? A total land/sea/air environment in a condensed area. The amount of unique missions is staggering. Air to air, shipping attacks, surface engagements, carrier warfare, troop support, Washing Machine Charlie missions.
I can't imagine a more varied environment that existed in WW2
The issue would be distance that Japanese units have to travel. Can't remember how far Rabaul was but maybe an in-flight spawn for Bettys? Maybe a closer airfield in the Russells?
Thoughts?