If I were him, I would be very thankful for what I have (as I am am anyway) and would share my success with others. In this case it would mean opening it up and footing the bill for the maintenance of the beach. Why not? Does he really need more money pragmatically? It seems like the good will, feeling of joy coming from helping your local community in which you live, and leaving the world better than you found it would be more than enough return for the investment. I'm a "working stiff" and happily contribute to the upkeep, cleanliness and worthy volunteer organizations in the community I live and get far more from such than it takes from me.

Edited- spelling error.