This research aims to verify the relationships between destination ij3dentity, environmental concern, and environmentally responsible behavior (ERB), based on the Cognition–Affect–Behavior (C–A–B) model, in the Sun-Link-Sea Forest Recreation Area (SLSFRA) in Taiwan. This study also aims to address the gap in understanding whether tourists’ family structure, with or without children, influences the impact of destination identity on their environmental concerns and ERB. A total of 431 samples were collected through convenience sampling and analyzed using structural equation modeling. The findings indicated that destination identity significantly influenced environmental concern, which in turn affected the general and specific ERB. Environmental concern acted as a mediator between destination identity and ERB. Specifically, tourists who strongly identified with the destination were more inclined to be concerned that its environmental condition influenced their travel experience, encouraging them to take action to protect the environment. Families with children who had greater environmental concern exhibited stronger general and specific environmentally responsible behavior (ERB) compared to families without children, who were more influenced by the impact of forest destination identity on their ERB. Practical implications for management and future research suggestions are proposed for relevant organizations and researchers.