Post offices near ports on POA

Just wondering if their are Post Offices close to the port in Maui, Kaui, and Kona. Would like to mail some packages back home so don't have to worry about overage in pounds on luggage when we go home two weeks later.

A quick Google Maps (or similar program) search reveals for Kahului (Maui), it is at 138 S. Puunene St, probably 6 or 8 blocks from the ship. For Lihue (Kauai), it is on Rice St, but a good long walk away. In Kona, it is on Palani St, about 4 or 5 blocks from where you come ashore.

Just a little research...