Casa Marina has a disco that goes til 2 or 3 am. The "free" bars close at 11:00pm and I think that the "pay" bar (marlin bar) on the "Beach" side stays open as long as the disco. It will depend on the tourists that are there during your stay whether its quiet or lively after the shows. Personally, I love the weekends when the Domincans are the biggest presence in the hotel. The music, food and atmosphere are all very much improved. Generally, I think that most people drink til 11 or 12 pm then go to the discos or bars that are outside the grounds less than a 5 min walk away but maybe things have changed since the last time I stayed in an AI (CMR) was Dec 02. Venturing out in Sosua can be an all day event or a five minute event depending on what you are doing. The Casa Marina is in the heart of Sosua. You are already there so no day trip necessary. You can walk across the street, with your drinks, and watch a ball game or explore the shops and bars that are within a few steps of the hotel, or go to the public beach and for a few pesos be waited on hand and foot. How much more relaxing can you get? lol