THE British Tourism Office in Hong Kong has been inundated with inquiries about walking holidays in Britain following an article which appeared in our Saturday Review Travel Page (August 6) on the Pennine Way. They have run out of maps depicting the more than 60 long distance walks which can be tackled, and tell us they are unable to provide information on specific walking tours. However, Travel Advisers in Hong Kong have come to the rescue. They inform us that they can arrange walking holidays in Britain along some of these scenic routes. Contact Brian Smith, tel 522-5181 or fax 840-0428. Travel Advisers can also arrange tours of Buckingham Palace. The palace opened again to the public on August 8, and escorted tours are taking place six days a week until October 1. THE Kilauea Point National Wildlife Refuge on the Hawaiian island of Kauai has reopened to the public. The 203-acre wildlife sanctuary was closed after Kauai was hit by Hurricane Iniki in September 1992. Nesting sites, wildlife habitats and buildings in the refuge, including the visitor centre and lighthouse, were damaged. Visitors can now hike the trails, observe the nesting sea birds, admire the ocean sea cliffs and depending on the season, watch migratory whales and seals. And while on the subject of Hawaii, the Hyatt Regency Maui is offering a fifth night free to guests staying four nights, including room upgrade and complimentary buffet breakfast for two. Fax (808) 667-4499 for details of their ''Three for Free' offer. VISITORS to Ocean Park between now and August 29 will have a chance to win holidays in Thailand. They must correctly identify ''Treasures of Thailand'' at a Thai pavilion at Kids' World to enter a prize draw. First prize is a one-week holiday for a family of four at resorts in Bangkok and Pattaya, with return air tickets. Other prizes include holidays in Phuket and Chiang Mai. DINERS Club credit cards are now accepted in Vietnam, joining American Express, Visa and several other cards whose use was authorised after the United States lifted its economic embargo six months ago. PHEW-JI. A Japanese man aged 100 has become the oldest person on record to scale Mount Fuji, eclipsing the feat of a man who conquered the peak at age 99. Ichijiro Araya climbed the mountain (3,776 metres) this month at the age of 100 years and 258 days. Araya began the climb with his 73-year-old son Tetsuo. It took them three days.