To tour independently you need to be at least 18 years of age. There are no higher age limits for most of our excursions (although 18-to-Thirtysomethings excursions are confined solely to 18-to-39-year-olds). Also, visitors with pre-existing scientific conditions are required to whole a scientific questionnaire. Our Family Adventures are open to households with children aged between 6 and 17 years of age. Our preferred (non-family) adventures are open to youngsters aged 12 years or older when accompanied by way of a mum or dad (max. two teenagers per adult). The two-children-per-adult restriction does no longer practice to our Family adventures
