Where Republicans are strongest is actually to the West of the city, around Pearl Harbour. (Ewa, Mililani, etc) Which shouldn't be surprising given the heavy military bent of that area...
Here's election results by State House district. Any errors be mine (I compiled these from precinct results). Descriptions may be vague.
Hawaii County
1 66.9 - 32.1 North coast
2 61.6 - 37.5 Hilo north
3 60.9 - 38.5 Hilo south
4 65.0 - 34.0 around Cape Kumukahi
5 65.3 - 33.6 Southern 40% of island
6 51.4 - 47.6 Kailua-Kona
7 55.9 - 43.3 East coast north from Kailua-Kona
Maui County
8 60.8 - 38.2 Wailuku area west
9 62.5 - 36.8 Wailuku area east
10 56.5 - 42.7 west half of island, remainder
11 55.4 - 43.7 east half of island, west coast
12 61.4 - 37.8 east half of island, inland
13 66.7 - 32.0 east half of island, n and e coasts; Molokai, Lanai
Kauai County
14 62.4 - 36.6 North
15 60.4 - 38.8 Southeast
16 56.9 - 42.3 Southwest; Niihau
Honolulu County
17 49.8 - 49.8 Koko Head (three votes' margin)
18 51.3 - 48.2 Wailupe, Maunalua Bay
19 53.0 - 46.4 Waialae, Kahala
20 60.4 - 38.8 Saint Louis Heights (20 to 29 appears to be, roughly speaking, Honolulu)
21 60.1 - 39.1 Diamond Head
22 59.2 - 40.1 north of Kapiolani Boulevard
23 54.9 - 44.3 Waikiki
24 62.0 - 37.4 University area
25 57.9 - 41.4 Noho Ave, North Central Honolulu?
26 57.1 - 42.2 Punchbowl
27 54.7 - 44.7 North of Harbor area
28 53.1 - 45.8 Harbor area
29 45.6 - 53.6 Dillingham Boulevard
30 51.2 - 48.3 Likelike Highway
31 50.8 - 48.7 Salt Lake
32 45.3 - 54.2 Airport, Ford Island
33 51.3 - 48.3 Aiea
34 53.6 - 45.8 Pearl City, Royal Summit
35 48.5 - 51.0 Waipahu, Crestview
36 54.2 -45.4 Pacific Palisades
37 48.7 - 50.8 Mililani Town South
38 46.6 - 53. Mililani Town North
39 49.0 - 50.2 Wahiawa, Whitmore Village
40 40.9 - 58.5 Ewa west, Makakilo
41 45.3 - 54.2 area between Mililani Town and Pearl Harbor
42 45.6 - 53.7 Ewa
43 40.8 - 58.8 Ewa Beach
44 44.0 - 55.4 Nanakuli, Maili
45 46.9 - 52.0 Waianawe
46 46.6 - 52.8 north coast
47 45.8 - 53.3 northeast coast
48 53.7- 45.8 Kaneohe west
49 50.1 - 49.4 Kaneohe east
50 48.8 - 50.6 Kailua
51 51.9 - 47.2 Lanikai, Waimanolo
