It's more expensive ($726), but I just booked SFO-HKG-GUM-HNL-SFO. I have limited availability so I couldn't do better on price. The nice thing about this one is a 19 hour layover in HNL. Would have preferred more time in GUM, but HNL is nice too. Now I just need to figure out what I want to do for one night/morning near Waikiki.