I've found 21 18-30 somethings tours

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The Great South American Journey: Quito to Rio Adventure
operated by
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64 nights
£5759pp excluding flights
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Members are eligible for cashback on this trip of up to £115pp
Sydney to Brisbane Experience: Bushwalks & Surfing
operated by
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6 nights
£740pp excluding flights
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Members are eligible for cashback on this trip of up to £15pp
Moroccan Desert Adventure: River Canyons & Camels
operated by
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6 nights
£359pp excluding flights
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Members are eligible for cashback on this trip of up to £7pp
Zagreb to Athens: Adriatic & Ancient Capitals
operated by
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14 nights
£1470pp excluding flights
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Members are eligible for cashback on this trip of up to £29pp
Morocco Adventure: Culture & Colour
operated by
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16 nights
£919pp excluding flights
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Members are eligible for cashback on this trip of up to £18pp
New Zealand: Best of the North Island
operated by
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6 nights
£629pp excluding flights
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Members are eligible for cashback on this trip of up to £13pp
Kenya & Uganda Gorilla Overland: Forests & Wildlife Spotting
operated by
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14 nights
£3299pp excluding flights
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Members are eligible for cashback on this trip of up to £66pp
Vietnam, Laos & Thailand: Riversides & Railways
operated by
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21 nights
£1162pp excluding flights
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Members are eligible for cashback on this trip of up to £23pp
A Month in Central America: Beyond Tulum & Tikal
operated by
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28 nights
£2349pp excluding flights
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Members are eligible for cashback on this trip of up to £47pp
Bangkok to Bali Adventure: Street Eats & Beaches
operated by
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33 nights
£2507pp excluding flights
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Members are eligible for cashback on this trip of up to £50pp
Dubrovnik to Santorini: Croatia Highlights & Greek Island Hopping
operated by
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14 nights
£2379pp excluding flights
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Members are eligible for cashback on this trip of up to £48pp
Croatia to the Greek Islands: Zagreb Nights & Santorini Views
operated by
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20 nights
£2999pp excluding flights
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Members are eligible for cashback on this trip of up to £60pp
Canadian Rockies: National Parks Westbound
operated by
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13 nights
£1599pp excluding flights
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Members are eligible for cashback on this trip of up to £32pp
Budapest-to-Split Rail Tour
operated by
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13 nights
£1279pp excluding flights
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Members are eligible for cashback on this trip of up to £26pp
Indian Wildlife Adventure
operated by
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12 nights
£2999pp excluding flights
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Members are eligible for cashback on this trip of up to £60pp
Iceland Adventurer 6D/5N
operated by
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5 nights
£2563pp excluding flights
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Members are eligible for cashback on this trip of up to £51pp
Bohemian Europe Rail Tour
operated by
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20 nights
£2089pp excluding flights
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Members are eligible for cashback on this trip of up to £42pp
Whole of Europe Rail Tour
operated by
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28 nights
£3569pp excluding flights
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Members are eligible for cashback on this trip of up to £71pp
Central Europe Rail Tour
operated by
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14 nights
£1919pp excluding flights
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Members are eligible for cashback on this trip of up to £38pp
Berlin-to-Budapest Rail Tour
operated by
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7 nights
£849pp excluding flights
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Members are eligible for cashback on this trip of up to £17pp
Western Europe Rail Tour
operated by
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14 nights
£1919pp excluding flights
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Members are eligible for cashback on this trip of up to £38pp