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 opportunity to eat a plate of authentic char kway teow (flat rice noodles) is reason enough to visit Singapore. But the fact that its botanic gardens are an important center for science, research and the conservation of the famous rubber plant dont hurt either.