I've found 20 18-30 somethings tours

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Tour Operator Included Price Compare
Indochina Discovery: Seasides and Street Food
operated by
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29 nights
£2159pp excluding flights
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Members are eligible for cashback on this trip of up to £43pp
Yucatan Adventure: Merida, Tulum & Jungle Swims
operated by
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5 nights
£479pp excluding flights
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Members are eligible for cashback on this trip of up to £10pp
Zagreb to Dubrovnik: Parties & Plitvice Lakes
operated by
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6 nights
£899pp excluding flights
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Members are eligible for cashback on this trip of up to £18pp
Rome to Paris: Cobblestones & Cuisine
operated by
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19 nights
£3399pp excluding flights
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Members are eligible for cashback on this trip of up to £68pp
Quito to La Paz: Amazon & Ancient Cultures
operated by
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34 nights
£3479pp excluding flights
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Members are eligible for cashback on this trip of up to £70pp
Peru: Inca Jungle & Rainbow Mountain Trek
operated by
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6 nights
£869pp excluding flights
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Members are eligible for cashback on this trip of up to £17pp
Mayan Sun Southbound: Boat Rides & Ruins
operated by
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15 nights
£1199pp excluding flights
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Members are eligible for cashback on this trip of up to £24pp
Cambodia: Ancient Ruins & Boat Rides
operated by
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9 nights
£659pp excluding flights
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Members are eligible for cashback on this trip of up to £13pp
Viva Mexico: Ancient Ruins & the Mayan Riviera
operated by
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13 nights
£1249pp excluding flights
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Members are eligible for cashback on this trip of up to £25pp
Peru: Ancient Cities & the Andes
operated by
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13 nights
£1879pp excluding flights
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Members are eligible for cashback on this trip of up to £38pp
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
Lima to Buenos Aires: Deserts & Dancing
operated by
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34 nights
£4099pp excluding flights
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Members are eligible for cashback on this trip of up to £82pp
Lima to La Paz: Sandboarding & Sunsets
operated by
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20 nights
£2299pp excluding flights
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Members are eligible for cashback on this trip of up to £46pp
North to South India: The Taj Mahal & Coa Good Times
operated by
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20 nights
£1399pp excluding flights
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Members are eligible for cashback on this trip of up to £28pp
Cambodia & Vietnam: Night Markets & Noodle-Making
operated by
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19 nights
£1269pp excluding flights
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Members are eligible for cashback on this trip of up to £25pp
Volcano Trail: Waves & Local Ways
operated by
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16 nights
£1099pp excluding flights
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Members are eligible for cashback on this trip of up to £22pp
The Great South American Journey: Quito to Rio Adventure
operated by
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64 nights
£7649pp excluding flights
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Members are eligible for cashback on this trip of up to £153pp
Lima to Rio: Coast to Coast
operated by
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50 nights
£6679pp excluding flights
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Members are eligible for cashback on this trip of up to £134pp
Central American Journey: Rainforests & Ruins
operated by
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31 nights
£2199pp excluding flights
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Members are eligible for cashback on this trip of up to £44pp
Epic Central America: Seven Countries & the Softest Sand Ever
operated by
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44 nights
£3199pp excluding flights
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Members are eligible for cashback on this trip of up to £64pp