I also have a flex week. It's easy, you pay your MF before Jan, then you mail in a form before the 1st of January requesting the week and unit you want. (ie July Fourth, Prefer South tower, highest corner unit for example). The week and unit on the deed are basically a place holder. I mostly only requested for summer weeks, usually involving a holiday (Memorial, July 4 or Labor Day), and almost always get my request. We like to watch the fireworks on the barge from the beach. Once or twice, the staff will call you and say your requested week is not available and will offer other options. All in all, very very nice front desk, management and reservation staff. I think we paid $400 to join it into our HGVC account. If you want to trade your flex week, I would call the resort and tell them, they will assign you the highest point value week, most likely 5000 pts, available and help you with the process. Once your points are deposited into HGVC you can use them there or RCI. As far weeks 49-50, I would think you have a very good chance as it probably falls the week or two before Christmas and most people are busy getting ready for the Holidays. Your MF's include free sailing, kayaks, tennis, pingpong, mini gym, bike rentals, baby pool, etc. Big Grill downstairs by the pool. Nice but not fancy. More like a very nice family resort. Every unit is ocean front. Only 2 elevators and they can run slow when busy. They have luggage racks and shopping carts to help you bring your stuff up to the unit. Free parking but limited to 2 spaces.