Bay seniors with animal loving grandkids will hear a chorus of “awwws” when they visit the Marine Mammal Center at Sausalito’s Fort Cronkhite. This weekend the Center, a kind of hospital and rehab for sea creatures, is holding one of their monthly Marine Science Sundays with a special focus on sea lions. Patients generally include ailing or injured sea lions, seals, otters, dolphins, porpoises and sea turtles. You can sign up for a docent tour. General admission is always free.