1. It was nice chatting with you. 2. Well, it's getting late. 3. Anyway, I should get going. 4. (formal) Sorry, but I'm afraid I need to... 5. I'm sorry to cut you off, but I actually gotta run. (cut you off = interrupt you)
The Sea Lion Center will teach you more about these particular local residents who are famous for pitching up on the docks of pier 39. Boat whale tours an aquarium fairground rides and even a 7D cinema will also fill your day with fun.