V I Lenin
ORIGINAL: el cid again
Looking at a modern map, it is logical to assume that Denpassar is the main port and city of Bali. It is, however, incorrect before 1953, when Denpassar and the region of Southern Bali was developed. The center of both Dutch and Japanese administration, and the principal port, before that, was Singaraja - in hex 58/107.
Singaradja a.f.a.i.k is the centre of Bali at this time from 'native' perspective - but, don't forget, the meaningful thing on Bali from perspective of game is the airfield, which indeed is at Denpasar since c.1930 (hence the Japanese landing there, Badoeng-strait battle occurring where it did etc). So, there is not really much to 'do' on other hex of Bali.