Glossary

special interest tour  is a Tour catering to the Needs of a specific interest, such as bird-watching, whale-watching, river rafting, mountain biking, rain forest exploration among many others

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Other definition:
special interest tour is a tour designed to appeal to clients with curiosity or concern about a specific subject. Most such tours provide an expert tour leader and usually visit places or events of special interest to the participants. Examples of special interest tours include those featuring a particular industry or historical itinerary.