This is the Golden Dewdrop plant, Duranta erecta, a shrub native to Tropical America but not to Hawaii, where this photo was taken. The photographer,
Donna62, smartly noted when posting this lovely photo to Flickr that the species is considered one of Hawaii's Most Invasive Horticultural Plants, and this risk assessment will tell you a little more about why.
As with many tropical species, this plant is ridiculously showy, both in flower and fruit. Our invasives here in New England really cannot compete :-).
Thanks to Donna62 for sharing this photo under a Creative Commons license.