TWO one-off special-interest tours are on the market for October, both at prices that are low for such one-offs. The first is the Australian Seniors Golf Classic in Perth, with a six-night tour leaving Hong Kong on October 11. The cost is $10,990 per person sharing ($21,980 per couple, $12,490 single), including air fare on Qantas, airport/hotel transfers, transfers to the golf course on competition days, tournament fees, welcome cocktail party and award dinner. The hotel is the Hilton. The tour with accommodation at the Vines, which is on the golf course, costs $1,000 more, including buffet breakfast daily. The above prices are for players; non-players pay about $1,500 less. Contact Amex Travel, phone 844-8668 or fax 810-4757. The other package is billed as an eco-tour. Departing October 29 for Kenya, the seven-night (plus two on the plane) package costs $11,900 per person sharing ($23,800 per couple, $13,900 single), including air fare on Gulf Air, all transfers during the tour, daily breakfast (and all meals on four days), park entrances, transport charges and instruction by professionals. There is also an optional (US$240 or HK$1,860) dawn balloon safari. One night is spent in Nairobi, two in the Amboseli national park, two at Taita Hills, and two in Mombasa. There are tour programmes in Amboseli and at Taita to see the wild animals. The Mombasa stop is for relaxing by the sea. There will be a tour escortfrom Hong Kong. Contact Frontieres 56 Travel on 521-0571, or fax 868-4479. TWO ''first nights'' in London's West End theatres next month should be of interest. One is an Alan Ayckbourn play, Time of My Life, at the Vaudeville Theatre. The other is a revival of the 1960s musical Hair at The Old Vic. Contact Society of West End Theatres on (44-71) 836-3193 or fax (44-71) 497-2543. FOR passengers from Seoul on Cathay Pacific, Asiana and Northwest, passport inspections can now be carried out between 7 am and 5 pm at the Korea City Air Terminal in the Trade Centre Building in Seoul. THE price for a three-night tour to Guam and Palau is $6,090 per person sharing (so $12,180 per couple, $7,590 single) at the Hilton in Guam, or $6,290 ($12,580, $8,090) at the Pacific Islands Club. This price includes air fare (on Continental Airlines), airport/hotel transfers, three nights hotel, daily full breakfast, tax and service charge. One night is in Guam, two in Palau. There are some price variations: some days have a $200 surcharge, andafter September 1, there is a $200-$300 drop in the price. Contact Swire Travel, phone 844-8445, or fax 877-9560. THERE is a selection of offers in the market for travellers to Thailand: A stay at the Bangkok Meridien costs US$250 (HK$1,900) for three nights per person sharing (so US$500 per couple, US$430 single), including daily full breakfast (up to the end of September). Booking through Asian Tours Centre in Bangkok (phone 66-2-255-4221, or fax 66-2-253-2994), but your travel agent should be able to book this at the same price. The Choice hotels in Thailand (including three in Bangkok under the Comfort or Quality brand name) are discounting rates by 40 per cent. Book through your travel agent. End-of-low-season offer to Phuket: seven nights for $3,975 per person sharing (so $7,950 per couple, $4,825 single), including airfare on Dragonair, airport/hotel transfers, tax and service charge. Hotel is the Cape Panwa. The tour must be completed by the end of October. Contact The Travel Shop, phone 851-0108, or fax 851-7441. Information compiled by Travel Database, GPO Box 12761, Hong Kong. Fax 507-4620.