The Observation and Horizon lounges are terrific. The Mariner is my favorite over the Navigator. There is a promenade off the library/computer area that seems to be a great place to congregate. You can play games or do puzzles or read a book and everyone seems to go by the area so it's a good place to see and be seen. They put in a coffee bar there since we sailed her in 2003 - they used to just keep a pot of coffee and some pastries there as well.
