DVC members can hop to any WDW owned/operated resort except for all the pools at YC/BC/BCV, AKL/AKV and the BLT pool. As long as pool hopping isn't blacked out for the time you are visiting (usually around holiday times). Swan and Dolphin pools are also on the no-hop list.
DVC Members must be staying on points or a reservation made through MS at a WDW DVC resort in order to pool hop. If you are staying on a non-DVC reservation, you are not entitled to pool hop. If you are staying at a non-DVC resort on points, you are not entitled to pool hop. If you are not a DVC member and are renting a reservation from a DVC member, you are not entitled to pool hop.
You are supposed to show your room ID and Blue Member card to the front desk and ask them if you may pool hop to their resort on that day. And if the pool gets crowded, you may be asked to leave.
