Yes, it's Honolulu, Hawaii. They took part in Hawaii (Honolulu) greatest event, Pan Pacific Festival in Hawaii. They performed 3 japanese song, including Superstar, and Magokoro. (I'm not sure about the other one, I can't find the fancam). A fan shared some photos of them during the event.
Take a look at the rest of the photo under the cut
Credit : poppytea @ omonatheydidn't