💡 Detailed Explanation
The man initially suggests cleaning both the park and the riverbank. However, the woman points out practical issues like the number of volunteers and the need for a city permit. She proposes focusing on cleaning the park perfectly this time and announcing the riverbank cleanup as a plan for next year. The man agrees that this is a more realistic, step-by-step approach. Therefore, the first thing they decided to do is to concentrate on cleaning the park.