Oahu and Honolulu

The national memorial to the attack of 7 December 1941, with free museums, a Navy boat to the USS Arizona memorial above the wreck, and the battleship Missouri on Ford Island.

💡 Book the Arizona programme on recreation.gov as soon as slots open, as demand is very high, and come without a bag: they are not allowed, and there is a paid bag storage at the entrance. The Missouri, the Bowfin and the aviation museum are paid separately, or with a combined pass. Price: memorial free, $1 booking fee, about €1, parking $7, about €6.

The only royal palace in the United States, completed by King Kalākaua in 1882 with electricity before the White House, where Queen Liliʻuokalani was held prisoner after the 1893 overthrow.

💡 Tours Tuesday to Saturday, guided or with an audio guide, by compulsory online reservation, no later than the day before. Carry on to the Kamehameha statue, the State Capitol and Kawaiahaʻo church, a few minutes' walk away. Price: $28 for the audio-guided tour, about €24, a little more for the tour led by a volunteer guide.

A 1.3 km trail climbs a 300,000-year-old tuff crater by switchbacks, stairs and a 1908 military tunnel to a summit view over Waikīkī, Honolulu and the Pacific.

💡 Non-residents must book an entry slot, with or without parking, on the state parks website: take the first one, at 6am, for the cool and the light. The site is open from 6am to 6pm, last entry at 4.30pm. Price: $5 per person, about €4, and $10 for parking, about €9.

A horseshoe bay formed by a crater open to the sea, a marine reserve since 1967, where green turtles and over 400 fish species swim over a shallow reef close to shore.

💡 Closed on Mondays and Tuesdays. Non-residents book online two days ahead, at 7am Hawaii time, and places go within minutes; the reserve opens at 6.45am, last entry at 1.30pm. Rent a mask and fins on site or bring your own. Price: $25 per person, about €22, free for under-13s, and $3 for parking, about €2.60.