Streetview of Honolulu is available now.
Official marathon course does not contain steep 5%+ up/down hill as a rule, however, ... 
diamondhead road (7ml to 8ml)
to the peak of diamondhead road (8ml to 9ml)
do not forget upslope of freeway entrance...(11ml)
(this is a look back view from the top of the slope)
and this is a downslope exiting from H1
(view from bottom, 22ml)
finally, heart break hill...
(23-24ml)