We were in Fernandina Beach Florida for the week. We were out on the beach yesterday, when a LSA buzzed down the surf line (the demarcation between sand and water) at 100-150'. He flew a couple of miles South, reversed course, and again flew the length of the beach at that altitude. Obviously, he passed much closer than the minimum 500' from hundreds (thousands?) of people on the beach. There's no exclusion to the low flight regulations that could apply in that situation is there?