The US Post Office located in Waikiki is a popular and convenient option for locals and tourists alike. The staff at this location, particularly the middle-aged Asian gentleman, are consistently praised for their exceptional customer service. They are described as super helpful, kind, accommodating, and patient, going above and beyond to assist customers with their shipping needs. The cash-only policy, which seems to be a common practice for USPS locations on the island, is noted, but the presence of an ATM on the first floor helps alleviate this inconvenience. Customers appreciate the helpful suggestions provided by the staff, such as recommending the use of flat-rate boxes for cheaper shipping options. Overall, the US Post Office in Waikiki is a reliable and customer-focused establishment, making it a favorite among those who use this service.