Honolulu

No visa is required for entering the US for tourism or business trips within ninety days, as long as you have a return ticket.

Although it is acceptable to have a passport that is valid until the date of departure, it is preferable to have one that is valid for at least 90 days from the date of entry.

When using the visa waiver program to travel to or through (via) the U.S. without a visa by air or sea, you must obtain travel authorization from ESTA online (not possible on your phone). Do not forget this, as you may be refused boarding onto the plane or denied entry into the U.S. if you fail to obtain travel authorization from ESTA before your trip. When you obtain ESTA authorization, it is valid for two years and you can travel to the U.S. multiple times (you do not need to renew it every time you change your schedule or visit somewhere). The final permission for entry is given by the immigration inspector at the first port of entry.
Apply for and obtain travel authorization from ESTA soon after your plans to travel to the U.S. have been fixed. (It is strongly recommended that you complete the procedure at least 72 hours before leaving your country). You can no longer receive instant authorization after application, so it is best to complete the process early. The application can be made by a relative, travel agency (for a fee), or other third party.

Generally 2 years. However, if your passport expires before the authorization term ends, your ESTA authorization also expires. You must also re-apply if your name or passport number changes.

Fee: $21

According to 2015 changes in the visa waiver program and the enactment of the Terrorist Travel Prevention Act, individuals who have traveled to or been present in Iran, Iraq, North Korea, Sudan, Syria, Libya, Somalia, or Yemen on or after March 1, 2011 cannot travel to the U.S. using the visa waiver program. Relevant travelers must apply for a visa using the regular method at the American Embassy. For more information, see the American Embassy visa waiver programpage.

When visiting from Japan, it is prohibited to bring the following items into Hawaii.

The scope for tax exemption is 200 cigarettes, same as for regular cigarettes, and 50 units for Ploom TECH.

Children entering the country without both parents may be asked to present a consent form for the trip (in English) from their parents or the non-accompanying parent. For more information, inquire with the American Embassy.

Only a certain quantity of alcohol, tobacco, and perfume is duty free. The following numbers are per adult, so double the numbers for duty free quantities if you are traveling with another person. However, alcohol and tobacco products are not duty free for minors, so you will be taxed for products purchased under the name of children.

There is a 19-hour time difference between Japan and Hawaii. Midnight in Japan is 5:00 in the early morning the day before in Hawaii. There is no daylight saving time.

The idea that Hawaii is the land of perpetual summer is not correct; although the temperature does not vary as widely as it does in Japan, Hawaii still has four distinct seasons. From November to March, it is relatively more rainy, and it is cooler in the early mornings and evenings, requiring a jacket. In summer, there is a period of extremely hot days like summer in Japan. That said, Hawaii certainly has a comfortable climate throughout the year. During the daytime hours, the water temperature is pleasant for swimming almost every day, and the northeast trade winds keep the humidity down even at the height of summer. You can sleep soundly and comfortably at night without an air conditioner.