Sea turtles, shark, rays, star fish, barracuda and sponges are among the sights as we cruise across shallow, magnificently clear, smooth, Biscayne Bay.   We are heading for Boca Chita Key where a climb to the top of the lighthouse provides an awesome vantage point with views of the Miami skyline one direction and a patchwork of greens and blues around us and a string of islands/keys for as far as one can see. Biscayne National park; the bay, the keys, patch coral reefs just beyond them and mangrove lined shores, it is a beautiful place.  It is going to take a lot of care and discipline to keep it that way for generations to come in the face of ever growing south Florida development.