Collecting of natural souvenirs causes destruction of the natural environment as well as social and economic problems. The article shows that the next generation will have a tendency to aggravate such problems by collecting natural souvenirs. To discover the preferences of young people related to collecting natural souvenirs, the authors performed a survey in Poland on a sample of 426 persons aged 21–30. The survey has shown that 80.7% of young people participating in tourist trips bring souvenirs to their places of residence. As much as 61.4% collect natural souvenirs. Most people bring shells (53.9%), rocks (22.7%), and sand from seaside beaches (18.0%). Natural souvenirs are important to young Poles. This is confirmed by the following major motivations for collection: natural souvenirs are unique (26.2%), genuine (23.8%), bring back the best memories (22.6%), and cannot be bought in stores (14.5%). Only 9.8% of those surveyed oppose bringing of natural souvenirs, 5.2% deem such practices unlawful, and 11.2% recognize their detrimental effect on local tourist attractions. The article presents demarketing actions, which can largely stem the negative phenomenon of collection of natural souvenirs.