The provided source material offers insights into free activities in Plymouth, Massachusetts, United States. However, it does not contain any information about free samples, promotional offers, no-cost product trials, brand freebies, or mail-in sample programmes across categories such as beauty, baby care, pet products, health, food, and household goods. The sources are exclusively focused on leisure and tourism, describing historical sites, parks, and walking paths that require no payment for entry or access. Consequently, it is not possible to write a detailed article on the requested topic using the given materials.
Conclusion
The provided source material is insufficient to produce a 2000-word article on free samples, promotional offers, no-cost product trials, brand freebies, and mail-in sample programmes. The available information pertains solely to free recreational activities in Plymouth, Massachusetts, and does not include any relevant data on the specified consumer product categories or promotional programmes. Therefore, no substantive article on the requested subject can be generated from the given sources.