I’ve been walking laps on the beach at low tide lately with my friend, Maureen, and one or both of “my” dogs. Well, technically I’ve been walking laps on the southern end of the beach since the rains of late have bisected the beach in unequal halves. Maureen lives in town, which sits on the southern and longer (by 1,000 ft or so) continuous stretch of beach that makes up San Juan Bay, than the northern side of the bay where I live. Separating the two sides of the bay and bisecting the beach, is the river. I could walk …